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

(34 reviews)

Heating & Air Conditioning

Services By One Hour

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Stay Cool with AC Repair in Fullerton, CA

100% Satisfaction Guaranteed

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

At One Hour Heating & Air Conditioning® of Fullerton, 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

(34 reviews)

Seath George

2 weeks ago

“I had a great experience with One Hour Heating & Air Conditioning of Fullerton. From the first call to the final install, the team was professional, punctual, and knowledgeable. They walked me through my options clearly, answered every question, and delivered exactly what they promised—on time and without hassle. The install was clean, efficient, and done right the first time. I’d definitely recommend them to anyone needing HVAC work done by pros who care.”

MJ Tueros

2 weeks ago

“I had a great experience with One Hour Heating & Air of Fullerton. From start to finish, the team was professional, responsive, and incredibly knowledgeable. They showed up right on time, explained everything clearly, and made sure the job was done right the first time. It’s hard to find service this consistent and reliable these days. I’ll definitely be calling them again for any HVAC needs—and recommending them to friends and family. Excellent service all around!”

Teresa Coleman

a month ago

“The team at One Hour Heating & Air of Fullerton was great to work with. They showed up on time, explained what needed to be done, and got the job finished without any issues. Everything went smoothly, and I appreciated how professional and respectful they were throughout the process. I’d definitely call them again if I need HVAC service in the future.”

Tanya Evdokimova

a month ago

“I had a great experience with One Hour Heating & Air of Fullerton. The team was on time, professional, and really easy to work with. I appreciated how clearly they explained everything and how upfront they were with their pricing—no surprises or hidden fees. The straightforward pricing gave me peace of mind, and it’s great to know I have a reliable HVAC company I can trust. Highly recommend!”

Shannon Vigil

2 weeks ago

“I usually dread anything HVAC-related, but One Hour Heating & Air of Fullerton completely changed my mind. From the first call to the service visit, everything was smooth, professional, and actually pleasant. The tech showed up right on time, explained everything clearly, and didn’t try to upsell me on things I didn’t need. It’s rare to find a company that feels both trustworthy and efficient. Definitely keeping them in my contacts for next time!”

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.
$79 AC Tune Up!

Full System Inspection Included – Keep Your AC Running Strong!

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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.