What does the One Hour mean in your company name?

The 'One Hour' in our company name indicates our guarantee to be at your home in the predetermined window quoted when you set your appointment. If we do not show up within that window, your service call fee is waived. 1. Express Appointment: This is an appointment that is scheduled during a specified one-hour time slot. You are promised that a technician will arrive at your home within this one-hour time window. You will also receive a call when the technician is en route to your home. 2. Reserved Appointment: This is an appointment that is scheduled during a specified, two-hour time slot. You are promised that a technician will arrive at your home within this two-hour time window. You will also receive a call when the technician is en route to your home. 3. Standard Appointment: This is an appointment that is scheduled during a specified four-hour time slot. You are promised that a technician will arrive at your home within this four-hour time window. You will also receive a call when the technician is en route to your home. 4. Stand-By Appointment: This appointment is for overflow situations. This appointment will not have a specified time. You will receive a call when the technician is en route to your home. 5. Emergency Appointment: This appointment is for an unspecified time after normal business hours Monday – Saturday and all day on Sundays/Holidays. Calls are dispatched in the same order they are received. You will also receive a call when the technician is en route to your home.

Do you service emergencies after-hours?

Yes, we offer emergency services 24-hours a day, year-round.

How much will my service cost?

The size and complexity of your HVAC issue will determine the cost. Because our trained, licensed HVAC technicians must diagnose the issue before we are able to quote you an accurate cost, we require an appointment to be set to complete a diagnostic on your system. Once the diagnostic is complete, your One Hour(R) technician will walk you through all costs using our Straightforward Pricing(R) Guide so there are never any surprise fees.

How often should I service my HVAC system?

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.

How often do I need to change my HVAC filter?

Your filter should be changed every one to three months, depending on conditions in your home and your region's climate.

Do you offer purchase financing?

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.

What are the advantages of a smart Thermostat?

Smart thermostats learn a household's patterns and adjust heating and cooling according to when a home is occupied, give homeowners the ability to control the thermostat remotely, and enable homeowners to reduce their energy use, saving you money.

HVAC means Heating, Ventilation, and Air Conditioning. HVAC systems refer to air conditioners, furnaces, and any unit that cools indoor spaces during the summer and warm them in the winter. In general, an HVAC system takes in air, heats or cools that air, and blows it into a room or any indoor space. While many homes have separate air conditioning and heating units, others have a heat pump that cools and heats the house. Not only do HVAC systems maintain desired temperatures, but they also improve indoor air quality and regulate humidity levels. But most importantly, these units provide comfort all year round.

What is a SEER Rating?

The SEER (seasonal energy efficiency ratio) is a measure of the efficiency of your heating and cooling system.The higher the SEER rating, the more efficiently a unit operates. The SEER rating of any given unit can range anywhere from 13 to 21.

Bringing Comfort Home

With Expert AC Services

One Hour Heating & Air Conditioning® of Fullerton

(6 reviews)

Heating & Air Conditioning

Services By One Hour

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Two One Hour Heating & Air Conditioning technicians standing confidently in front of a service van.

Heating, AC & Furnace Repairs in Fullerton, CA

100% Satisfaction Guaranteed

When homeowners want a reliable heating or air conditioning system that they don’t have to think about, they call One Hour Heating & Air Conditioning. We are the premier HVAC service provider in the United States for a simple reason: we actually care about your comfort.

At One Hour, we respect you, we respect your time, and, most importantly, we respect the trust that you put in us to keep your home comfortable. It’s why we back all of our work with a 100% customer satisfaction guarantee for two years, and it’s why we’re always on time—guaranteed.

We Have a Reputation

For Being Punctual, Friendly and Knowledgable

(6 reviews)

Catherine Kim

a month ago

“As a single woman, I was initially terrified to call anyone for help when my furnace stopped working and feared I’d be taken advantage of, especially since I was just talking to someone over the phone and had no idea what to expect. From the moment I contacted One Hour Heating & Air Conditioning, I felt completely at ease. They were not only professional but also incredibly thoughtful and kind, ensuring I understood everything that was going on every step of the way. The team showed such genuine care and respect. They were trustworthy, and it was clear they knew their craft inside and out. They explained everything thoroughly, and I never felt pressured into any decisions. The work they did was excellent, and my system is running better than ever! I am so happy with the service I received and grateful to have found a company I can rely on for the future. I now know that when I need HVAC help again, I can call them with confidence, knowing I'll be treated with honesty and professionalism. Highly recommend!”

Donna Chung

a month ago

“I had a great experience with One Hour Heating and Air Conditioning when they replaced my AC unit. The team did an excellent job with the installation and made sure everything was set up perfectly. They took their time to explain the issue thoroughly and made sure I was happy with the work before leaving. I highly recommend them!”

Reed Miller

2 months ago

“Can’t say enough. I recently hired One Hour Heating and Air Conditioning to perform regular maintenance on my mother-in-law's furnace, and the experience was outstanding. The technician was on time and took the time to ensure everything was running efficiently. They provided helpful recommendations without any pressure and treated her home with great care. I’ll definitely continue using them for both maintenance and repairs.”

angelo calderon

2 months ago

“Honesty, punctual,and trust worthy. I had One Hour Heating & Air Conditioning come to my home to perform the annual maintenance on my HVAC for this upcoming summer season. They told me my system was working appropriately, and gave me the necessary recommenations to ensure the system stays in tip top shape. The techs were very knowledgeable and answered all my questions in detail. I highly recommend them for all your HVAC services.”

Amanda L

4 weeks ago

“I have really been impressed with One Hour Fullerton. The owner, Matt, is doing everything right. With their StraightForward Pricing Guide, I know exactly what I am getting and how much it will cost. Thank you, One Hour!”

HVAC Services You Can Count On

Our customers love what we do because we treat them like the neighbors they are to us. While we carry the One Hour name, we're an independently owned and operated business with a personal investment in the local community. We back our work with a 100% satisfaction guarantee, provide StraightForwardPricing® guides for your benefit, and will pay you back for being even one minute late to an appointment.

Here For You

When You Need Us Most!

Yellow One Hour Heating & Air Conditioning service van with company branding and slogan.

'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.