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 Chattanooga

4.6

(103 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.

HVAC Repair, Installation & Maintenance

Heating, AC & Furnace Repairs in Chattanooga, TN

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

4.6

(103 reviews)

Inkpaws

04-05-2025

“Had a few different services out to get some sort of heating/cooling installed for my house. Unfortunately, while a good house, everything about it upside down, backwards, crooked, and inconvenient. Dustin came out to take measurements and put together an estimate with a couple of options. He was extremely nice and friendly, didn't talk to me like I was stupid, nor mention any of the quirks of the place like some of the other services. Which did play a roll in my decision making. Poor Dustin was also very patient and essentially had to hold my hand with all the questions I had, because I just know nothing when it comes to houses and doing this sort of thing. The guys that came out were also super nice. I get optical migraines, so every place in the house and light bulb is insufferably dim, but they had their own lights for what they needed. They were very quick and efficient, and one of the men was also nice enough to let me know when they were done in the main area so I could let my dogs back in. And, I wish I had gotten the name of that man-- he's the one who installed the heads. He absolutely has putting those in down to a science. I am so wildly impressed that he managed to get one installed in the living-room. It truly fits perfectly, there was no room for error and he absolutely nailed it. Wendy at the office was also very nice and helpful. All of the communications with her and Dustin were very quick and efficient. Given the lack of space in the crawl and attic, we ended up having to install a mini-split with two heads. My husband was rather cynical about it. But, so far, we've only had it set on the 'dry' mode and it is truly shocking how cold it feels in the house vs outside on just that setting alone, which seems to have won him over. I'm looking forward to see how it does throughout the more serious summer heat, but at this rate it does seem as though it'll really keep up!”

JASON SMITH

03-13-2025

“I had an issue with my HVAC system when both the AC fan and capacitor went out. I called One Hour in Chattanooga and they responded quickly, sending a technician out the same day. Danny was professional, knowledgeable, and had everything needed to get my system back up and running. Pricing was fair, and they took the time to explain everything clearly. If you’re looking for a reliable HVAC company in Chattanooga, I highly recommend them!”

Campbell Norton

02-27-2025

“Great guy!”

Andrew Hill

02-27-2025

“Danny is great to work with, super personable, and most importantly, professional!”

Madelyn Cross

02-27-2025

“Great service!! highly recommend”

Kensley Helton

02-27-2025

“Amazing services and employees!! Danny is amazing!”

Apollo T Technix

02-26-2025

“We recently moved to the Chattanooga, TN area and needed HVAC services right away. After doing some research, we decided to give One Hour Heating & Air Conditioning a try, and we are so glad we did! From the moment I called to schedule an appointment, their customer service was friendly, professional, and quick to respond. The technician, Danny, arrived on time and was incredibly knowledgeable. He quickly diagnosed the issue with our air conditioner and explained the necessary repairs in clear detail. What stood out most was the level of professionalism and efficiency. The service was fast, affordable, and done right the first time. It's evident that One Hour Heating & Air Conditioning is committed to providing top-notch service and high-quality work. They truly live up to their name, offering fast, reliable, and expert HVAC solutions for all your heating and cooling needs. If you're in need of HVAC repair, installation, or maintenance in the Chattanooga area, I highly recommend One Hour Air Southeast. Whether you need emergency AC repair or routine service, this company is the one to trust!”

George Mullinix

02-25-2025

“You can depend on One Hour Heating and Air Conditioning. Impeccable service, reliable HVAC systems and maintenance care.”

Cassandra Atkinson

10-21-2024

“Our AC went out and we had One Hour come to check it out. We ended up getting a new HVAC system. We paid exactly what they quoted us. When the furnace didn't turn on the first time we tried to use it (weeks later), they came right out and fixed the issue. They arrived within their time window every time and everyone was friendly. Specific shout out to Chris who was very polite, friendly, and explained everything. Would recommend this company!”

Allison Shoemaker

09-14-2024

“I highly recommend One Hour Heating and Air for any of your HVAC needs. During extreme weather conditions our unit started acting up and it just so happened to be a holiday week. I contacted One Hour about the issues I was having and requested a service call. The lady who answered the phone was extremely nice and they came out the same day and had the unit repaired the next day even with a part having to be ordered. This company is professional, reliable, prompt and friendly. Thank you!!”

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, were an independently owned and operated business with a personal investment in the Chattanooga and North Georgia communities. We back our work with a 100% satisfaction guarantee, provide StraightForward® pricing 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.