What’s the best thermostat setting for summer in Fullerton?

For optimal comfort and energy savings during summer in Fullerton, set your thermostat to 78°F (25°C) when you're home. If you're away, raising it to 85°F can help reduce cooling costs. Using a programmable or smart thermostat can make these adjustments automatic and more efficient.

Do you provide emergency after-hours HVAC service in Fullerton?

We are available 24/7 to take your call for emergencies. Our appointment hours are listed above.

How can I improve indoor air quality in Fullerton?

To improve indoor air quality in Fullerton, start by regularly changing your HVAC filters, scheduling routine maintenance, and using air purifiers. Consider duct cleaning if your home has excessive dust or allergy symptoms. Proper ventilation and keeping your home clean are key to healthier air.

How often should I service my HVAC system in Fullerton?

It’s ideal to service your cooling system each spring and your heating system each fall to ensure you find small issues before they become big problems.

Do you offer HVAC financing in Fullerton?

We work built relationships with several lenders to ensure our customers are able to restore comfort in their homes. Ask your technician about your financing options.

How often should I have my furnace serviced in Fullerton?

It’s recommended to have your furnace professionally serviced once a year, ideally in the fall before the heating season begins in Fullerton. Annual maintenance helps ensure safe operation, improves efficiency, and can extend the life of your system.

How often should I have my air ducts cleaned in Fullerton?

It’s generally recommended to have your air ducts cleaned every 3 to 5 years in Fullerton, or more often if you notice dust buildup, allergies, or musty odors. Homes with pets, recent renovations, or high pollen levels in Fullerton may benefit from more frequent cleanings to maintain healthy indoor air quality.

How often should I schedule AC maintenance in Fullerton?

You should schedule AC maintenance once a year, ideally in the spring before the cooling season starts in CA. Regular tune-ups help your system run efficiently, prevent breakdowns, and extend the life of your unit, especially important in Fullerton's summer climate.

What size HVAC system is right for my home in Fullerton?

The right HVAC system size for your home in Fullerton depends on factors like square footage, insulation, number of windows, and local climate. A professional load calculation ensures your system is properly sized for comfort and efficiency. Oversized or undersized units can lead to higher energy bills and uneven temperatures.

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Fullerton HVAC Services

One Hour Heating & Air Conditioning® of Fullerton

4.9

(71 reviews)

Heating & Cooling

Services By One Hour

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HVAC Emergencies

Fast 24/7 emergency HVAC repairs to restore your comfort when you need it most today.
Air Conditioning

Reliable air conditioning services to keep your home cool and comfortable all year.
Thermostat Repair

Expert thermostat services for precise temperature control and maximum energy savings.
Ductwork

Expert ductwork services to optimize airflow and maximize HVAC system efficiency.
Indoor Air Quality

Comprehensive air quality solutions for healthier, cleaner indoor air in your home.
Heating

Professional heating services to keep your home warm and comfortable year-round.

Fullerton AC Services

Air Conditioning Repair, Installation & Maintenance

When homeowners want dependable heating and air conditioning they can rely on, they turn to One Hour Heating & Air Conditioning®. As a leading HVAC company in Fullerton, we provide expert Fullerton AC repair, heating services, and complete comfort solutions that keep your home comfortable year‑round. Our reputation is built on reliability, transparency, and a genuine commitment to putting customers first.

We know that home comfort is about more than just temperature. It is about peace of mind and confidence in the company you trust. That is why our experienced technicians take the time to listen, explain your options clearly, and recommend solutions that are right for your home and your budget. One Hour of Fullerton proudly serves the communities in and around Brea, Hacienda Heights, La Habra, La Habra Heights, La Mirada, Rowland Heights and more. If you live in the Fullerton area, you can count on us to deliver quality workmanship every time.

From emergency repairs to long‑term HVAC solutions, One Hour Heating & Air Conditioning® of Fullerton is committed to making home comfort simple, reliable, and stress‑free.

One Hour Heating & Air Conditioning technician Checkin HVAC.

Hours of Operation

We are available 24/7 to take your call for emergencies. For all other services, our appointment hours are:

Monday

24 hours

Tuesday

24 hours

Wednesday

24 hours

Thursday

24 hours

Friday

24 hours

Saturday

24 hours

Sunday

24 hours

Special Offers

Mention these discounts at time of service

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FREE WI-FI THERMOSTAT

Upgrade To A Smart Home - Free Wi-Fi Thermostat With Every System Replacement!

Valid at participating locations. Limit one coupon per household. Coupon must be presented at time of purchase. Cannot be combined with any other offers or discounts. Some restrictions, taxes and fees may apply.
HEROES CLUB PRICING

Exclusive Discounts For Military, First Responders & Teachers

Membership services listed and plan discounts vary and may change based on individual franchise location. Membership renewal period is one year. Cannot be combined with any other offer. Not redeemable for cash. Valid only at participating locations.
Upgrade & Save Big – Limited Time Offer!

$1,000 Off System Install/Replacement

Limited-Time Offer: Get $1,000 OFF a New System Installation or Replacement! Whether your current system is aging or you're ready to upgrade to a more energy-efficient model, now’s the perfect time to make the switch. Why choose One Hour Heating & Air of Fullerton? ✔️ On-time service — guaranteed ✔️ Expert, trustworthy technicians ✔️ Industry-leading warranties for your peace of mind This offer won’t last long — call now or book online to claim your $1,000 savings!

If no repair is made, service fee may apply. Limit one coupon per household at participating locations. Coupon must be presented at time of purchase. Cannot be combined with any other offers or discounts. Management reserves the right to modify offers at any given time. Some restrictions, taxes and fees may apply.
$149 AC Tune Up!

Full System Inspection Included – Keep Your AC Running Strong!

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Fullerton HVAC Services You Can Count On

At One Hour Heating & Air Conditioning® of Fullerton, respect guides everything we do.

We respect your time by arriving when we say we will, with an on‑time guarantee you can count on.
We respect your home by treating it with care and professionalism from start to finish.
Most importantly, we respect the trust you place in us as your HVAC company in Fullerton.

Our HVAC services are backed by a 100 percent customer satisfaction guarantee for two full years. As a locally owned and operated business, we are personally invested in the comfort of our community and the quality of every job we perform. Our team delivers clear, upfront pricing through StraightForwardPricing® and honors your schedule with an on‑time promise that pays you back if we fall short.

We have a reputation for being punctual, friendly and knowledgable

4.9

(71 reviews)

Read More Reviews

Techs were courteous, friendly, knowledgeable and mainly professional. Explained in detail the problem a part quit working, needed to be replaced. Not a cheap part. The great thing is they had it in hand. No need to order and wait for it to arrive. Thank you very much techs! .

MPW 333

3 months ago

Overall best experience ever! Kind, helpful, Product knowledge was on point on a/c plus knowledgeable about our water heater (which ended up being the issue ) even though wasn’t his or his company’s fix. Josh let us know the problem and pointed us in the right direction’. Most guys would have said not our problem now pay us hundreds and leave. Our price $0 plus the knowledge of actual problem and which “guy” to call! 3 experiences with this company and they never let us down!!!!highly recommend’!!!

Keely Perdew

3 weeks ago

We had a new AC and heating system installed in our home and couldn’t be happier with the experience. From the initial consultation to the final installation, the service was outstanding. The team was professional, on time, and took the time to explain everything. The installation was done efficiently and neatly, and the system works great. It’s rare to find service this reliable! Highly recommended!

Hannah Seeker

5 months ago

I highly recommend One Hour Heating & Air Conditioning to anyone who needs a tune up on their system or an overhaul. Cody answered my call promptly and was able to offer an estimate over the phone before coming out to do a thorough walkthrough on my system. Even though I asked for a quote to replace my entire system, they went ahead and validated that it was, in fact, unrepairable. I appreciate their honesty and integrity.

Aracely Cuadra

2 months ago

Cody did an excellent job—super professional, knowledgeable, and easy to work with. He took the time to explain everything clearly and made the whole process smooth from start to finish. You can tell he really cares about his work and his customers. He’s currently in the process of fixing a big A/C job for us, and based on how thorough and attentive he’s been so far, we feel confident it’s in great hands. On top of that, he’s just a genuinely nice guy—respectful, friendly, and easy to talk to. Highly recommend Cody if you’re looking for someone you can trust to get the job done right.

Israel Larracuente

2 months ago

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'Round the Clock Availability

No matter the hour, you can trust One Hour to be there to help you when you get hit with the unexpected.
100% Satisfaction Guarantee

We guarantee our materials, labor, and craftsmanship for up to two years from the date of your service.
StraightForward Pricing® Guide

Before we start any work, we discuss your available options so you know exactly what you are getting and how much it will cost. No hidden fees!
Always On Time…Or You Don’t Pay A Dime!®

We understand your time is valuable, so we promise to arrive at your home within the predetermined time window that you select, or your service call is free.

Financing Available!

Prioritize your comfort without fronting the entire bill on day 1 – contact us today to learn more about financing options.

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One Hour Heating & Air Conditioning® of Fullerton services the following communities:

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