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Posts Tagged: HVAC System

Why Ductless Mini Splits Are A Smart Choice for Your ADU

Posted by & filed under Air Conditioning, Air Conditioning Services, HVAC.


A ductless mini split is the best heating and cooling system for almost every ADU. ADUs are too small to justify ductwork, and there’s rarely attic or floor space to run it. A single-zone mini split heat pump handles both heating and cooling, installs through one small wall penetration, and meets California’s Title 24 energy requirements without a duct system.

The Problem Most ADU Owners Hit

You’ve got the ADU plans drawn up. The permit is moving along.

Then your contractor asks how you’re handling air conditioning for the space.

One company wants to tie the ADU into the main house furnace. Another suggests a tiny ducted system inside a closet you didn’t budget for. A third suggests putting in AC window units.


You’re building a long-term rental or a place for your family, and you don’t want it to feel cheap.


The problem isn’t your ADU plans. It’s that traditional ducted HVAC was never designed for a 600 square foot building.

That mismatch leads to oversized equipment, wasted square footage, and higher bills for the next 15 years. In this article, we’ll cover sizing, zoning, efficiency, code, cost, and how to get help.

Why ADUs Rarely Support Ducted HVAC Systems

Ducts need somewhere to live. ADUs simply don’t have that space.

Most Southern California ADUs are built with low-slope roofs, minimal attic clearance, and slab foundations. There’s no chase, no crawlspace, no room for trunk lines.

Adding a duct system usually means dropping ceilings or surrendering a closet. In a 500 square foot unit, losing a closet hurts.

Ducts also leak. The ENERGY STAR program points to ductless systems specifically for additions, outbuildings, and spaces where extending ductwork or capacity is difficult.

Tying an ADU into the main house system creates a different headache. Your tenant’s comfort and your own thermostat end up fighting each other.

Southern California’s ADU Boom Makes This a Common Question

If you have considered adding and ADU in Southern California, you’re far from alone.

Research from the UC San Diego Center for Housing Policy and Design found that ADU permits in San Diego County more than tripled between 2020 and 2024, rising from 1,150 to 3,991 a year. Completed ADUs jumped from 342 to 1,984.

Los Angeles and Orange County have followed the same curve. Backyard housing units are now a normal part of the SoCal housing picture.

That growth in ADUs means one thing for you: HVAC installers have done this exact job, so you don’t have to accept a guessing game on equipment.

How To Size a Mini Split for Your ADU Square Footage

Sizing is where most ADU HVAC projects go wrong.

The rule of thumb for mild coastal Southern California is roughly 20 to 25 BTU per square foot. A good contractor confirms it with a Manual J load calculation.

Rough starting points look like this:

  • 300 to 500 sq ft studio ADU: 9,000 BTU single-zone system
  • 500 to 800 sq ft one-bedroom ADU: 12,000 BTU single-zone system
  • 800 to 1,200 sq ft two-bedroom ADU: 18,000 to 24,000 BTU, often split across two zones

Adjust upward for west-facing glass, vaulted ceilings, or inland heat in Riverside County. Adjust downward for a well-insulated new build with high-performance windows.

Oversizing is the most expensive mistake. An oversized mini split short-cycles, never dehumidifies properly, and leaves the room clammy.

Single-Zone vs Multi-Zone Mini Splits for ADUs

Single-zone means one outdoor unit paired with one indoor air handler. It’s the right call for open-plan studios and most one-bedroom ADUs.

Multi-zone runs one outdoor condenser to several indoor heads. Each head creates its own comfort zone with its own setpoint.

Choose multi-zone when your ADU has a separated bedroom, a second story, or a room your tenant wants cooler at night. Two zones handle that easily.

Single-zone systems generally cost less, run more efficiently at part load, and are simpler to service. Start there unless your floor plan says otherwise.

Efficiency, SEER2, and Real Operating Costs for ADUs

Modern ductless heat pumps are dramatically more efficient than what your ADU tenant would otherwise plug in.

ENERGY STAR reports that certified mini splits use up to 60% less energy than standard electric radiators. They also avoid more than 4,500 pounds of greenhouse gas emissions over the system’s life.

Look for a SEER2 rating of 16 or higher for cooling, plus an HSPF2 of 8 or better for heating. Premium inverter models reach SEER2 ratings above 20.

One system covers both seasons. A heat pump mini split cools in August and heats in January, so your ADU needs no gas line and no separate furnace.

Title 24, Permits, and California Incentives

California code now leans hard toward heat pumps.

The California Energy Commission confirmed the 2025 Energy Code took effect January 1, 2026 for new buildings and major renovations. The code steers new construction toward heat pumps for space and water heating through its energy budgets.

Since ADUs are new construction, your unit gets a Title 24 compliance report. A ductless heat pump makes that report easy to pass.

Permits are straightforward. Your mini split install is typically pulled as a mechanical permit alongside the ADU building permit, with electrical for the dedicated 208/240V circuit.

On rebates, one thing changed recently. The IRS confirms the federal Energy Efficient Home Improvement Credit applies to property placed in service before December 31, 2025, so it’s no longer available for 2026 installs. Check current utility programs through your local provider instead.

What a Mini Split Costs for an ADU in Orange County

Real numbers help you budget.

A single-zone ductless mini split, professionally installed in a Southern California ADU, typically runs $4,500 to $8,000. Capacity, brand, line-set length, and electrical work drive the range.

Two-zone systems generally run between $9,000 to $14,000 installed. Three or more zones climb from there.

Installation usually takes one day for a single-zone system. Larger multi-zone jobs run two days.

At Thomson Air Conditioning, our team designs and installs ductless mini split systems across Los Angeles and Orange County, including full turnkey installs and assisted DIY options that protect your manufacturer warranty.

Frequently Asked Questions About Mini Splits for ADUs

What size mini split does a 600 square foot ADU need?

A 600 square foot ADU in coastal Southern California typically needs a 12,000 BTU single-zone mini split. A Manual J load calculation confirms the exact size.

Can one mini split heat and cool an entire ADU?

Yes. A single ductless heat pump handles both heating and cooling for most open-plan ADUs up to roughly 800 square feet.

Do I need a permit for a mini split in my ADU?

Yes. Mini split installs in California ADUs require a mechanical permit and electrical permit, and the ADU needs a Title 24 energy compliance report.

How much does a mini split cost for an ADU in Southern California?

A single-zone installed system typically costs $4,500 to $8,000. Two-zone systems generally range from $9,000 to $14,000 installed.

Is a mini split cheaper than adding ductwork to an ADU?

Almost always. Ductless installs avoid dropped ceilings, chases, and lost closet space, and they skip the energy losses that come with duct runs.

Get Your ADU Comfortable Year Round

Your ADU residents deserves better than a window unit and a space heater.

A properly sized ductless mini split heat pump gives you quiet, efficient, room-by-room comfort. It clears Title 24, costs less than retrofitting ducts, and keeps your tenant happy for well over a decade.

Thomson Air Conditioning has helped Seal Beach, Huntington Beach, Long Beach, and Orange County homeowners get their ADUs dialed in. Call (562) 201-3014 or visit the Thomson Air Conditioning contact page to book your ADU mini split consultation.

A Guide to Air Conditioning Repair in Fountain Valley

Posted by & filed under AC Repair, Air Conditioning, Air Conditioning Services.

Quick answer: When your AC stops cooling in Fountain Valley, check three things first. Replace a dirty filter, confirm the thermostat is set to cool, and reset the breaker. If the unit still runs warm, freezes over, or won’t start, call an HVAC technician. Peak-summer repair slots fill quickly so it’s better to get a repair or maintenance early.

Avoid the Hot Afternoon WHEN Your AC Gives Up

Picture this: it’s late August in Fountain Valley. The temperature outside is topping 90 degrees. The house is closed up to stay cool, the AC has been running all day, and something changes.

For some reason, the air coming from the AC vents feels lukewarm.

You check the thermostat. It says 74. The hallway says otherwise.

Every Orange County homeowner knows this feeling. The system isn’t dead, exactly. It’s running, humming, using power, and cooling nothing.

Here’s what makes late summer different. Your air conditioner has now worked hard for four straight months.

Small faults that stayed hidden in June finally tip the system over. A slightly low refrigerant charge. A dirty coil.

Ignoring it gets expensive fast. A struggling AC unit draws more power every day it runs. Left long enough, a minor airflow issue becomes a frozen evaporator coil, then a failed compressor.

In this article, we’ll cover what usually goes wrong and what you can check yourself. Then we’ll look at when the problem needs a professional.

Why Air Conditioners Fail Most Often in Late Summer

Cooling equipment fails when it’s worked hardest. That’s late July through September in Fountain Valley.

The U.S. Department of Energy lists the most common AC problems. They are refrigerant leaks, electrical control failure, sensor issues, drainage problems, and dirty filters.

Nearly all of them get worse with runtime.

Two-thirds of American homes have air conditioning. Homeowners spend around $11 billion a year powering those systems.

Here’s the part most people miss. A system rarely fails all at once.

The AC system degrades. Airflow drops a little. The compressor works a little harder. Your power bill creeps up for weeks before the cooling actually stops.

ENERGY STAR reports that airflow problems alone reduce a system’s efficiency by up to 15 percent. You pay for that inefficiency long before you feel the discomfort.

One misconception is worth correcting. Many homeowners assume refrigerant gets “used up” like fuel.

Refrigerant doesn’t. A sealed system holds its charge indefinitely. So if your refrigerant is low, you have a leak. Topping it off without finding that leak only delays the same repair.

What to Check Before You Call

Some late-summer AC problems have simple fixes. Run through these first:

  • Replace the air filter. A clogged filter restricts airflow and is the single most common cause of poor cooling. The Department of Energy notes that filter maintenance lowers energy consumption by 5 to 15 percent.
  • Check the thermostat. Confirm it’s set to cool, and that the fan is on auto rather than on.
  • Reset the breaker. AC units draw heavy current in peak heat and sometimes trip a breaker.
  • Clear the outdoor unit. Pull back plants and debris so the condenser can breathe. Give it two feet of clearance on all sides.

If the AC system cools normally after these steps, you’re done.

When to Call aN AC Technician Instead

Some symptoms point to problems that get worse with DIY attempts. Book professional air conditioning repair in Fountain Valley when you notice any of these:

  • Ice on the refrigerant lines or coil. Airflow or refrigerant is wrong, and running the system frozen strains the compressor.
  • Grinding or squealing from the unit. Usually a motor bearing or blower problem.
  • A burning smell near the air handler. Shut the system off at the breaker and call the same day.
  • Water pooling around the indoor unit. The condensate drain is blocked.
  • Short-cycling every few minutes. The system starts and stops without completing a cooling cycle.

Ice is the one to act on quickly. Turn the AC system off, switch the fan to on so the coil thaws, then book the repair.

Most straightforward repairs finish in under two hours. A capacitor replacement or a clogged drain line falls in that range.

Refrigerant leak work takes longer, because finding the leak is the real job.

Why Timing Your AC Repair Call Matters

Late summer is the busiest stretch of the year for every HVAC company in Orange County.

A call placed Monday morning gets a faster slot. The same call on a Friday afternoon, mid heat wave, does not.

If your system is cooling but struggling, book it now rather than waiting for a full failure. You’ll get a better appointment window. A small repair also costs far less than an emergency one.

Thomson Air Conditioning serves Fountain Valley as part of its regular Orange County service area. That area also covers Huntington Beach, Seal Beach, Costa Mesa, Newport Beach, and Los Alamitos.

You can see the full range of HVAC services in Fountain Valley on our site.

Frequently Asked Questions

Why is my AC running but not cooling? The usual causes are a clogged filter, a dirty condenser coil, low refrigerant from a leak, or a failing capacitor. Start with the filter. Call a technician if the problem continues.

Why is my air conditioner freezing up? Ice forms when airflow drops or refrigerant is low. Turn the AC system off, run the fan to thaw the coil, and book a repair. Running it frozen risks compressor damage.

How long does AC repair usually take? Most common repairs finish in under two hours. Refrigerant leak repairs take longer, since locating the leak is the time-consuming part.

Should I repair or replace my air conditioner? Repair usually makes sense for systems under 10 years old. For older units facing a major repair like a compressor or coil, replacement is often the better value.

Do I need to be home during an AC repair? Yes. A technician needs access to both the indoor air handler and the outdoor condenser to diagnose the system properly.

Getting Your Fountain Valley Home CoOL Again

A late-summer AC failure rarely happens without warning. Weak airflow, rising power bills, and a system that runs constantly are all early signals.

Check the filter, the thermostat, the breaker, and the clearance around the outdoor unit.

If those don’t solve it, bring in a technician. Ice, grinding, or a burning smell all mean the same thing: call before the compressor takes the damage.

Call Thomson Air Conditioning at (562) 201-3014 to book your air conditioning repair in Fountain Valley today.

Is Your Smart Thermostat Actually Costing You Money?

Posted by & filed under Air Conditioning, Air Conditioning Services.

Smart thermostats have become one of the most popular home upgrades for improving comfort and reducing energy costs.

But while smart thermostats are packed with helpful features, one setting in particular can sometimes work against you: learning mode.

At Thomson Air Conditioning, we install smart thermostats every day, and one of the most common misconceptions we hear is that a learning thermostat will always save money automatically. In reality, that’s not always the case.

How Learning Thermostats Work

Learning thermostats are designed to observe your daily routine and automatically create a schedule based on your habits. Over time, they adjust when your heating or air conditioning turns on and off without requiring you to program it yourself.

When your routine is consistent, this feature can be incredibly convenient.

However, if your schedule changes often, learning mode can begin creating a schedule that no longer matches how you actually live.

When Learning Mode Can Increase Your Energy Bills

Imagine you normally leave for work every weekday, so your thermostat is programmed to keep the house comfortable only when you’re home.

One afternoon, you come home early for lunch or to grab something from the house. A learning thermostat may interpret that as part of your new routine and begin cooling or heating your home at that same time every day, even when you’re not there.

Over time, those unnecessary heating and cooling cycles can increase your energy usage without you realizing it.

Temporary Changes Can Become Permanent

The same thing can happen when:

  • You have family or guests staying with you.
  • You work from home for a few days.
  • Your vacation or holiday schedule changes.
  • Someone manually adjusts the temperature several times.

A learning thermostat may assume these temporary behaviors are permanent and modify its schedule accordingly.

The Best Way to Use a Smart Thermostat

Smart thermostats are excellent tools, but they work best when you stay in control.


If your thermostat offers a learning feature, allow it to learn your routine for a short period if you’d like, then review the schedule it created. Once you’re happy with it, consider turning off automatic learning so your schedule doesn’t continue changing every time your routine varies.

This gives you the convenience of automation while keeping your home’s comfort and energy efficiency predictable.

Need Help Choosing the Right Thermostat?

Not every home needs the same thermostat. The best choice depends on your HVAC system, your family’s schedule, and the features you’ll actually use.

At Thomson Air Conditioning, we help homeowners throughout Huntington Beach and Orange County choose, install, and optimize smart thermostats that improve comfort without wasting energy.

If you’re thinking about upgrading your thermostat or have questions about your current AC system, reach out to Thomson Air Conditioning today. We’re happy to help you find the right solution for your home.

AC & Heating Maintenance in Newport Beach: Stay Ready All Year

Posted by & filed under Air Conditioner, Air Conditioning, Air Conditioning Services, HVAC.

Get your Newport Beach home ready for fall and winter with seasonal AC and heating maintenance. For most of the year (and sometimes many years) your AC seems fine, but routine maintenance catches wear before it becomes an urgent repair. Explore our residential HVAC maintenance plan and call (562) 201-3014 to schedule.

That’s how most Newport Beach homeowners treat their AC unit. Out of sight, out of mind, until the day it stops on a random 89-degree afternoon.

But here’s what you can’t see underneath the hood. Dust slowly builds up on the coils. A small refrigerant leak can gradually reduce cooling performance. The drain line collects debris. Each issue slowly but surely chips away at performance.

Of course, you don’t notice because it happens gradually. Your electricity bills creep up. The house takes slightly longer to cool. The AC system makes different noises than in years before.

This slow decline of your Newport Beach AC system is the real cost of skipped maintenance. In this article, we’ll explore what a maintenance visit includes and why it saves you money. We’ll also show you how to keep your HVAC system ready through fall and winter.

Why Skipped AC Maintenance Costs You More Than You Think

Maintenance feels easy to skip. The AC works, so why pay for service?

The numbers tell a different story. According to the U.S. Department of Energy, neglecting necessary maintenance can reduce air-conditioning performance while regular maintenance helps the system operate effectively.

That lost efficiency shows up on every electric bill. In Newport Beach, seasonal cooling costs can add up fast. Even a modest efficiency loss can increase cooling costs over time.

There’s a bigger cost too. The Department of Energy recommends regular maintenance to help air-conditioning systems operate effectively.

Skipping maintenance can allow small performance issues to go unnoticed until they become more disruptive.

Then there’s comfort. A well-maintained AC keeps your home steady through a heat wave. The CDC reports that heat is the leading weather-related cause of death. A dependable AC is your first line of defense at home.

Coastal Newport Beach makes AC maintenance matter even more. Salty ocean air corrodes outdoor coils and electrical parts faster than inland air does. That extra wear is exactly what a yearly maintenance visit is built to catch.

What an AC Maintenance Visit in Newport Beach Actually Includes

A maintenance visit ($159) is our detailed, component-by-component service. It goes well beyond a quick tune-up ($99), which is an inspection-based check with a filter change. On a maintenance visit, a licensed HVAC technician inspects, cleans, and tests your whole system.

Here’s what a maintenance visit covers:

  • Refrigerant check. Low refrigerant can cause weak cooling and frozen coils and may indicate a leak.
  • Coil cleaning. Dirty condenser coils force the system to work harder for less cooling.
  • Electrical inspection. Capacitors and contactors wear out faster in salty coastal air.
  • Drain line flush. A clogged condensate line can cause water problems or an AC shutdown.
  • Thermostat calibration. A small miscalibration wastes energy on every cooling cycle.
  • Airflow and blower test. Weak airflow strains the compressor and shortens its lifespan.

Visit length depends on the system and its condition. The ENERGY STAR program recommends annual pre-season checkups by a professional contractor.

Most of these checks happen out of sight. That’s exactly why their value is so easy to underestimate.

You can handle one piece yourself between visits. Swap your air filter every 1 to 3 months during cooling season. A clean filter protects airflow and keeps the blower from straining.

Everything else needs trained hands and proper tools. Refrigerant and electrical work are jobs for a licensed technician, not a weekend project.

When to Schedule AC Maintenance in Newport Beach

Timing matters when planning AC maintenance.

Maintenance needs vary by system type, condition, accessibility, and service scope. Thomson AC can review your equipment and explain the recommended work before service begins.

Finding wear or performance issues during planned maintenance can give you more time to understand your options before an urgent breakdown.

Timing is the other half. For fall and winter readiness, schedule your AC and heating check before temperatures drop. Service calendars can fill when seasonal demand rises, and planned maintenance helps avoid disruptive breakdowns.

Explore Thomson AC’s residential HVAC maintenance plan hub to learn about ongoing maintenance options for your home.

Our Newport Beach HVAC team handles maintenance across Newport Beach and the rest of coastal Orange County.

Planned maintenance can make it easier to keep routine HVAC care on your household calendar and address recommendations before peak cooling demand.

Heater Tune-Ups for Newport Beach Homes

Once the evenings cool down, your furnace goes back to work after months of sitting idle. A quick check before the first cold night helps you avoid a heater that won’t stay lit.

You have two options:

  • Tune-up, $99. A quick, inspection-based visit. We make sure your heater starts and runs safely, check for obvious issues and change your filter.
  • Maintenance visit, $159. A detailed, component-by-component inspection. For heating season, we also flush the drain line and clean the flame sensor, which is a common cause of a furnace that lights and then shuts off.

If your system is newer and running fine, a tune-up is usually enough. If it’s older, or it gave you trouble last winter, the maintenance visit is the better choice. If something needs repair, we’ll explain it and give you the price before any work starts. See our furnace repair page for details.

Call us or Text us at 201-3014 to book, or ask for a Free Estimate. Financing is available through Goodleap.

Keep Your Newport Beach Home Comfortable Through Fall and Winter

Skipped maintenance is a quiet problem with a loud ending. Lost efficiency, higher bills, and a breakdown at the worst possible moment.

The fix is simple and affordable. Regular professional maintenance can help your AC operate effectively and reduce the chance that developing issues go unnoticed.

If you’re in Newport Beach, Costa Mesa, or anywhere across Orange County, Thomson Air Conditioning is ready to help. Our licensed technicians have served local homeowners for decades and know coastal AC systems inside and out.

Call Thomson AC at 562-201-3014 or reach out to us online to book your Newport Beach AC maintenance today. Prepare your system for fall and winter.

Ready for a fall tune-up? Join our residential HVAC maintenance plan or Call us at (562) 201-3014 for a Free Estimate. Serving Newport Beach, Huntington Beach, and Orange County.

AC Maintenance FAQs for Newport Beach Homes

When should I schedule a fall AC or HVAC tune-up in Newport Beach?

Book your fall visit before cooler nights settle in, typically September through early November. A pre-winter check helps catch problems before a no-cool weekend or the first cold night. A $99 tune-up is a quick inspection with a filter change; a $159 maintenance visit adds a detailed component-by-component inspection, including salt-air checks on outdoor equipment. Call us at (562) 201-3014 to schedule.

What is included in a Thomson AC maintenance visit?

A maintenance visit ($159) covers airflow and filter checks, outdoor coil cleaning and a drain line flush, electrical connections and capacitors, thermostat verification, and a performance check so you know whether the system is ready for the season. For heating season, we also clean the flame sensor. You get clear notes on anything that needs attention, with no mystery upsells.

Should I choose a one-time tune-up or the residential maintenance plan?

A one-time visit is fine if you only need this season covered: a $99 tune-up for a quick inspection and filter change, or a $159 maintenance visit for a detailed component-by-component inspection. The residential HVAC maintenance plan is for homeowners who want regular seasonal care on the calendar without having to remember to book it. Ask us and we’ll explain the current plan details for your Newport Beach home.

Do you service Newport Beach, Huntington Beach, and nearby Orange County?

Yes. Thomson AC serves Newport Beach, Huntington Beach, and Orange County homes for AC and HVAC maintenance, repair, and plan visits. We are a local Huntington Beach–based team, not a national call center. Call us or Text us at (562) 201-3014.

How do I book fall maintenance or ask about the plan?

Call us at (562) 201-3014 for a Free Estimate or plan options, or review the residential HVAC maintenance plan and tell us which visit window works for your home.

Why Is My Air Conditioner Freezing Up? Here’s What It Usually Means

Posted by & filed under Air Conditioning, Air Conditioning Services.

If you’ve ever looked at your air conditioner and found the refrigerant lines or indoor coil covered in ice, you’re not alone.

While it may seem strange for an air conditioner to freeze up during the summer, it’s actually a common HVAC issue, and it’s usually a sign that something isn’t working correctly.


At Thomson Air Conditioning, one of the most common questions we hear is, “Why is my AC freezing up?” The answer typically comes down to one of two things: restricted airflow or low refrigerant.

The #1 Cause of AC Freezing: Restricted Airflow

Your air conditioner relies on a steady stream of warm air moving across the evaporator coil. As that air passes over the coil, the refrigerant inside absorbs heat, cooling your home.

When there isn’t enough airflow, the coil gets colder and colder until moisture in the air freezes onto it. Over time, that thin layer of frost can become a solid block of ice.

Think of it like an ice skating rink. An ice rink is essentially a cooling system with very little airflow. Without warm air constantly passing over the surface, it continues getting colder until ice forms. Your evaporator coil behaves the same way.

Common causes of restricted airflow include:

  • A dirty or clogged air filter
  • Blocked or closed supply vents
  • Damaged, kinked, or disconnected ductwork
  • A dirty evaporator coil
  • Poor duct design that doesn’t move enough air

If your AC is freezing repeatedly, checking the airflow should always be the first step.

The Second Common Cause: Low Refrigerant

The other major reason an AC coil freezes is low refrigerant.

As refrigerant pressure drops, so does its temperature. If the pressure becomes too low because of a refrigerant leak, the evaporator coil can fall below freezing, causing ice to form.

Unlike a dirty filter, refrigerant doesn’t get “used up.” If your AC system is low on refrigerant, there’s almost always a leak that should be found and repaired by a qualified HVAC technician.

Signs Your Air Conditioner May Be Freezing


Watch for these common symptoms for your AC freezing:

  • Ice on the refrigerant lines
  • Frost covering the indoor evaporator coil
  • Water dripping around the indoor unit after the ice melts
  • Weak airflow from your vents
  • Your AC runs constantly but struggles to cool your home

Ignoring these signs can lead to reduced efficiency, higher utility bills, and even compressor damage.

What Should You Do If Your AC Freezes?

If you notice ice on your AC system:

  1. Turn off your air conditioner.
  2. Switch the fan to ON to help thaw the ice.
  3. Check and replace your air filter if it’s dirty.
  4. Make sure all vents are open and unobstructed.
  5. If the system freezes again after thawing, schedule a professional inspection.

Continuing to run a frozen system can make the problem worse and may cause expensive damage.

Keep Your System Running Efficiently

Many frozen air conditioner problems can be prevented with routine maintenance. Regular inspections help identify airflow issues, dirty coils, refrigerant leaks, and other small problems before they become major repairs.

If your air conditioner keeps freezing up, the team at Thomson Air Conditioning can diagnose the cause and get your AC system back to cooling efficiently.

Whether it’s a simple airflow issue or a refrigerant leak, we’ll help you find the right solution so your home stays comfortable all summer long. Reach out to us and we can get you back up and running for the long hot Southern California summer head.

AC Repair in Costa Mesa: Get Fast Help When Summer Heat Hits

Posted by & filed under AC Repair, Air Conditioner, Air Conditioning, Air Conditioning Services, HVAC.


It always happens at the worst time. The Costa Mesa afternoon hits 90 degrees. You walk inside expecting relief. The house feels like an oven.

You check the thermostat. The AC is running. The air coming out of the vents is warm.

That moment of panic is real. You start doing the math on a repair bill you didn’t plan for. You wonder how long your family has to sweat it out.

Most AC breakdowns aren’t random. They build slowly through spring. A low refrigerant charge. A tired capacitor. A clogged drain line that finally gives up.

By the time the heat arrives, your AC unit is running on borrowed time. Then it stops.

The good news is that most summer breakdowns are fixable, often same-day.

In this article, we’ll explore what causes these failures and what repairs cost. We’ll also show you how to find fast help.

Why COSTA MEsa AC Units Break Down in Summer

Heat is the trigger, not the cause. Your AC works hardest in July and August. That extra strain exposes weak parts that limped through spring.

A few failures show up again and again in Costa Mesa homes:

  • A failed capacitor. This small part starts the compressor. Heat wears it out fast, and the AC stops cooling.
  • Low refrigerant from a slow leak. Your system blows warm air and the outdoor coil can freeze over.
  • A clogged condensate drain line. Water backs up, the safety switch trips, and the AC shuts off.
  • A worn compressor. Years of run time and skipped maintenance take their toll.

Heat also raises the stakes. According to the CDC, heat is the leading weather-related cause of death in the United States. The National Weather Service warns that indoor heat is especially dangerous for kids, older adults, and pets.

A broken AC isn’t just uncomfortable. During a heat wave, it’s a real safety issue.

Coastal Costa Mesa adds its own twist. Salt-laced ocean air corrodes outdoor components faster than inland conditions. That corrosion eats at electrical contacts and coil fins over time.

So a system that would last 15 years inland might show trouble sooner here. Local wear patterns are part of why repairs cluster in the summer months.

What AC Repair Costs and How Long It Takes

Here’s the part most homeowners want to know first: the price.

A typical AC repair in Costa Mesa runs $150 to $800. Simple fixes are at the low end. A capacitor swap or drain clearing often costs $150 to $400 and takes under an hour.

Bigger AC repairs such as a refrigerant leak repair runs $400 to $1,500 depending on the leak. A failed AC compressor is the priciest fix, often $1,200 to $2,800.

Most repairs wrap up in a single visit. A licensed technician diagnoses the problem, confirms the price with you, and gets your home cool again the same day.

When you call Thomson Air Conditioning, you get a clear diagnosis and an honest quote before any work starts. No surprises on the bill.

There’s a smarter long game too. The U.S. Department of Energy reports that a well-maintained AC keeps its efficiency and lasts years longer. A small repair caught early often prevents a full replacement later.

The order of the bill matters too. Diagnosis fees usually run $75 to $150, and a good company rolls that into the repair cost. Ask before you book.

Watch out for flat-rate quotes given over the phone. No honest technician prices a compressor without seeing your system first.

How to Get Fast AC Help in Costa Mesa

Speed matters when your home is heating up. Here’s how to handle a breakdown without making it worse.

First, shut the system off if you see ice on the outdoor unit or smell burning. Running a frozen or overheating AC causes more damage.

Next, check the simple stuff. A tripped breaker or a packed air filter sometimes solves the problem in two minutes. A clogged filter starves the system of airflow.

If that doesn’t fix it, call a professional. The Department of Energy recommends professional service for any refrigerant, electrical, or compressor issue.

This is where local HVAC experience matters. A Costa Mesa company knows that coastal adjacent AC systems and the salt-air corrosion that wears them down faster. Our residential HVAC team handles repairs across the area, including same-day calls during heat waves.

Don’t wait days for relief. The longer a broken AC sits, the hotter your home gets and the more a small problem can grow.

While you wait for the technician, stay cool safely. Close blinds against the afternoon sun. Run fans to keep air moving. Drink plenty of water.

Get Your AC Running Again Today


A summer AC breakdown in Costa Mesa feels like an emergency because it is one. Warm air, a hot house, and a repair bill you didn’t expect add up to a stressful day.

The fix is usually simpler than you fear. Most repairs cost a few hundred dollars and finish in a single visit. The key is acting fast before the problem spreads.

Has your AC quit in Costa Mesa or across Orange County? Thomson Air Conditioning is ready to help. Our licensed technicians have served the local Costa Mesa area for years.

We know how to get coastal systems cool again fast.


Call Thomson AC at (562) 373-2386 or reach out to us online to book your AC repair today. Beat the heat, and get your Costa Mesa home comfortable again fast.

A Smart Guide to Air Conditioning Installation in Seal Beach

Posted by & filed under Air Conditioner, Air Conditioning Services.

Your air conditioner in Seal Beach has worked hard for years. Now it feels like it’s limping through summer. It feels hotter inside than outside. Your energy bills climb every month. Your AC unit cycles on and off without cooling much.

Maybe an HVAC tech told you the compressor is already shot. Or the refrigerant is leaking faster than they can recharge it.

At some point, the math no longer works to continue doing AC repairs. When you are considering the cost of a new AC installation, the choices can feel confusing.

Which size AC unit? Which AC unit brand? Which efficiency rating?

Many homeowners get stuck in decision fatigue and end up waiting, figuring they can suffer through one more summer with a failing system.

The cost of waiting for an AC replacement adds up fast. The U.S. Department of Energy confirms that older AC units use 30 to 50% more energy than modern high-efficiency systems.

In this article, we’ll cover everything you need to know about air conditioning installation in Seal Beach. We’ll explain how to size your system, what costs to expect, and how to find local help.

What Drives AC Installation Decisions in Seal Beach

Seal Beach homes have specific cooling needs. Coastal homes near Main Street and the Pacific Coast Highway enjoy mild summers most years, while inland areas like College Park East and The Hill see hotter peaks. That climate variety changes which AC system fits your home best.

New federal regulations also shape your options. The Department of Energy confirms all new central AC units sold after January 2023 must meet SEER2 efficiency standards, so older SEER ratings no longer apply. For Seal Beach homes, the minimum SEER2 rating is 14.3, though higher-efficiency units offer 16, 18, or even 22. The higher the rating, the lower your monthly bill.

Common AC installation choices include:

  • Central split systems for whole-home cooling
  • Heat pumps that provide both cooling and heating
  • Ductless mini-splits for additions, garages, or zoned rooms
  • High-efficiency variable-speed units for maximum savings

Sizing matters more than most homeowners realize. An oversized unit cycles on and off, wears out faster, and creates humidity problems, while an undersized unit runs constantly without ever keeping up. That is why pros use a Manual J calculation to size your system, factoring in square footage, insulation, windows, ceiling height, and sun exposure. A 1,500-square-foot home in Seal Beach typically needs a 2- to 3-ton system.

Incentives can also affect the decision. The federal heat pump tax credit (25C) ended for systems installed after 2025. South Coast AQMD’s GO ZERO heat pump rebate is expected to reopen; ask us whether your system would qualify.

One myth costs Seal Beach homeowners thousands: the belief that bigger AC units cool better. They do not. Right-sized units always outperform oversized ones for comfort, efficiency, and lifespan.

How to Plan Your AC Installation


A smooth AC installation in Seal Beach starts with the right contractor. Begin with a free in-home consultation, where a pro will inspect your existing ductwork, measure your rooms, and check your electrical panel before recommending equipment based on your home’s specs and your budget.

Look for these signs of quality:

  • California C-20 HVAC license from the state board
  • Manual J load calculation for proper sizing
  • Written estimates with brand, model, and SEER2 rating listed
  • Trained, licensed installers who know current codes
  • Manufacturer warranties on parts and labor

Installation costs in Seal Beach vary by system. Standard central AC installations average $5,500 to $9,500, while high-efficiency systems run $8,000 to $13,000. Heat pump installations cost $7,000 to $15,000, and ductless mini-split systems start around $4,500 for single zones.

The full process usually takes one to three days. The crew removes the old equipment, installs the new components, runs new refrigerant lines, and tests the system before they leave.

Permits matter too. The City of Seal Beach requires HVAC permits for all installations, and quality contractors handle that paperwork for you. Skip the permit, and you will run into problems when you sell your home later.

Thomson AC handles air conditioning installation across Seal Beach, Old Town, College Park East, and Bridgeport. Visit our Seal Beach services page to see our full coverage area. Our team installs Carrier, Trane, Lennox, and other top brands, and we pull permits, handle inspections, and back our work with strong warranties.

We also offer financing options, and most Seal Beach homeowners qualify for low monthly payments on a new system.

After installation, our maintenance plans keep your new system running at peak efficiency. Plan members enjoy yearly tune-ups, priority scheduling, and lower long-term costs.

Timing your installation matters in Seal Beach as well. Spring and fall offer the best scheduling and the cleanest install conditions. Summer installs still happen fast, but contractor calendars fill quickly with repair calls.

The EPA confirms that high-efficiency AC systems can cut cooling costs by up to 20% compared to older units. On a typical Seal Beach home, that adds up to $300 or more in yearly savings.

Smart-thermostat integration adds even more value. Modern systems pair with Wi-Fi thermostats that learn your schedule and adjust cooling on their own, which protects your investment and lowers your monthly bills at the same time.

Get a New AC System Built for Seal Beach

Air conditioning installation in Seal Beach comes down to the right contractor, the right size, and the right system. New systems deliver real savings: lower bills, better comfort, and fewer breakdowns, and modern equipment lasts longer and runs cleaner than older units.

Thomson AC handles AC installations throughout Seal Beach, and our certified team handles sizing, equipment selection, permits, and the full installation. Stop fighting an old AC system that cannot keep up.

Call (562) 373-2386 to schedule your free consultation. You can also visit our contact page for an online quote. Your new comfort starts here.

How to Choose Reliable HVAC Service in Huntington Beach

Posted by & filed under AC Repair, Air Conditioner, Air Conditioning Services, HVAC, Indoor Air Quality.

Your home in Huntington Beach should feel like a coastal retreat. Cool, calm, and comfortable.

But when summer hits and the marine layer burns off by 11am, indoor temps climb past 80 degrees.

Your AC unit hums away, but the airflow feels weak. Rooms upstairs stay warm even with the system running.

Sound familiar?

When Your Coastal Comfort Slips Away

The problem usually points to one thing. Your HVAC system in Huntington Beach can’t keep up with the unique demands of coastal Orange County living.

Salt air accelerates corrosion on outdoor condenser coils. Marine humidity strains evaporator components.

Old AC units lose efficiency every year they run without service.

Many homeowners chase quick fixes. They call the cheapest contractor or skip seasonal tune-ups.

The result? Higher bills, repeat breakdowns, and shorter equipment life.

In this article, we’ll explore how to choose dependable HVAC service in Huntington Beach. You’ll see what matters in a contractor, and how Thomson AC can help if you need a hand.

Why Huntington Beach Homes Demand Specialized HVAC Care

Huntington Beach sits on the Pacific Coast. Salt air drifts inland from Sunset Beach and Bolsa Chica every day.

That coastal exposure changes everything for your HVAC unit. Sea salt settles on outdoor equipment and works on the aluminum fins and copper tubing over time.

Add the daily marine layer. Mornings in Huntington Harbour and other neighborhoods near the water are often damp and humid.

That moisture makes your AC work harder and wears on its parts.

The local climate also creates wide temperature swings. Coastal mornings can be cool while inland afternoons get hot.

Your HVAC system runs through every weather pattern Southern California sends.

Without regular care, that coastal wear adds up, and equipment near the beach can need repairs or replacement sooner than it should.

Common myths cost homeowners money. Two big ones to skip:

  • “Newer units don’t need maintenance.” False. Even new systems lose efficiency without yearly tune-ups.
  • “All HVAC contractors are the same.” False. Coastal HVAC requires specific training and parts knowledge.

The right contractor saves you money long term. The wrong one costs you your equipment.

How to Choose the Right HVAC Service Provider

Choosing reliable HVAC service in Huntington Beach takes a few smart steps.

Start with the basics. Verify the contractor holds a current California C-20 HVAC license. Check it through the California Contractors State License Board.

Next, ask about coastal experience. Any local pro should know how salt air affects condenser coils.

They should recommend protective coatings or stainless steel hardware.

Look for these signs of a quality HVAC company:

  • Trained, licensed technicians who know modern systems
  • Written estimates before any work begins
  • Local references from Huntington Beach customers
  • Clear communication about when they can come out and what happens next
  • Manufacturer-approved parts instead of generic substitutes

Pricing matters too. A good contractor explains the problem and gives you a clear price before any work starts, so you can decide without pressure.

Ask what a tune-up includes versus a full maintenance visit, and how repair and replacement quotes are put together.

Regular maintenance is the smart middle ground. Catching wear early is almost always cheaper than waiting for a breakdown.

Indoor air quality also matters in coastal homes.

Salt and sand particles enter through windows and doors. Standard filters miss the smallest particles.

A pleated MERV 11 filter or HEPA-grade air cleaner makes a big difference for allergy-prone families.

Quality contractors should offer indoor air quality assessments alongside HVAC service.

Skipping maintenance feels like savings at first. But small problems that go unchecked can turn into bigger, more expensive repairs.

Thomson AC offers full coverage for Huntington Beach homes. Visit our HVAC maintenance in Huntington Beach page to see what we cover.

We carry parts for every major brand. Our technicians know how to spot coastal corrosion early.

That saves you money on premature replacements.

We also offer maintenance plans for homeowners who want regular care on the calendar.

Need service? Call us or Text us at 201-3014 and we’ll get you on the schedule.

A solid maintenance visit covers the basics most homeowners skip.

The technician cleans condenser coils, checks refrigerant pressure, tests electrical connections, and lubricates motor bearings.

They also test airflow at every register and inspect the condensate drain for clogs.

Each step helps your system run better and last longer.

Skip maintenance, and efficiency slowly slips. That gap shows up in your monthly bill.

Heating Season HVAC Service in Huntington Beach

Huntington Beach winters are mild, but the nights still get cold, especially near the water when the marine layer rolls in. Most furnaces here sit unused from spring to fall. The first time you turn the heat on, dust has built up and small problems haven’t shown themselves yet.

Furnace repair. If your furnace won’t light, shuts off after a few minutes, blows cold air or makes a new noise, we’ll find the cause and explain it before any work starts. You get a clear price up front, and you decide. Learn more on our furnace repair page.

Heater tune-up ($99). A tune-up is a quick, inspection-based visit. We check that your furnace starts and runs safely, look for obvious problems and change your filter. It’s a good fit if your system is fairly new and running well.

Maintenance visit ($159). A maintenance visit goes further. We do a detailed, component-by-component inspection and, for heating season, flush the drain line and clean the flame sensor. A dirty flame sensor is one of the most common reasons a furnace lights and then shuts off. See what’s included on our HVAC maintenance in Huntington Beach page.

Not sure which one you need? Tell us your system’s age and how it’s been running, and we’ll give you a straight answer. For everything we do in winter, visit our heating services page.

Call us or Text us at 201-3014 for service or a Free Estimate. Financing is available through Goodleap.

Get Huntington Beach HVAC Help When You Need It

Reliable HVAC service in Huntington Beach comes down to three things.

The right contractor, regular maintenance, and quick action when problems start.

Coastal homes face conditions inland HVAC units never see. Salt air, marine humidity, and wide temperature swings stress your system.

The fix? Work with a contractor who understands the local environment. Schedule yearly tune-ups. Address small issues before they grow.

Thomson AC handles HVAC service across Huntington Beach, Sunset Beach, and Huntington Harbour.

Our technicians know the area, the climate, and what your system needs.

Call us at (562) 201-3014 or Text us to schedule service. Or use Free Estimate to book online. Your comfort matters, and we’re ready to help.

FAQ

How do I choose reliable HVAC service in Huntington Beach?

Start with a current California C-20 HVAC license (check CSLB). Ask about coastal experience with salt air and marine humidity, and look for clear maintenance plans and honest options.

Why do Huntington Beach homes need specialized HVAC care?

Salt air accelerates corrosion on outdoor equipment, and marine humidity plus temperature swings stress systems. Coastal-specific care helps equipment last longer.

What areas does Thomson AC cover for HVAC service?

Thomson AC handles HVAC service across Huntington Beach, Sunset Beach, and Huntington Harbour. Call us or text us at (562) 201-3014, or use Free Estimate.

What’s the difference between a heater tune-up and a maintenance visit?

A tune-up ($99) is a quick, inspection-based visit with a filter change. A maintenance visit ($159) adds a detailed component-by-component inspection, and for heating season a drain line flush and flame sensor cleaning.

Do you repair furnaces in Huntington Beach?

Yes. We diagnose and repair furnaces throughout Huntington Beach and nearby cities, and we explain the problem and the price before any work starts. Call us or text us at 201-3014.