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Gaithersburg, MD
Gaithersburg, MD
Bringing Comfort Home
Gaithersburg HVAC Services
One Hour Air Conditioning & Heating® of Gaithersburg
4.8
Heating, AC & Furnace Repairs in Gaithersburg, MD
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 Knowledgeable
4.8
Ian Mahaney
11-24-2025
“Mr Gilmer was great! He was right on-time, inspected and diagnosed the issue and repaired it quickly. Awesome to work with.”
Garry Sappington Sr
11-21-2025
“Mr Rojas was working good in my system”
Shirley Reiner
11-19-2025
“Mr Gilmer work good in my system”
Kristen Stelzer
11-17-2025
“Mr Gilmer was very kind and friendly and he explained everything he was doing and recommending clearly.”
Craig J. Panos
11-17-2025
“Mr Gilmer was working good in my system”
Lori Reese
11-14-2025
“Mr Gilmer Rojas was very professional and did a really great job!”
Patrick Monnig
11-13-2025
“One Hour Air has consistently been a dream. We had to have the install done in 2023 pre-labor day weekend when we had record highs. We had an HVAC unit that was older than I was. They were patient, explained every step of the process. They have been amazing on all of the upkeep visits. Recently we had water damage. They not only uninstalled and reinstalled our unit, but they were flexible when the repairs weren't completed and we had to shuffle our reinstall date. 10/10 would recommend time and time again. We are looking at using them for a few other projects! ( I can't name drop everyone, because I'm sure I'd miss someone, but insert all names of the different groups that have been to our house in the past two years! )”
Matthew Trout
11-12-2025
“Mr Gilmer was very helpful and explained everything he was doing.”
Jim Lutz
11-12-2025
“Mr Gilmer”
Robert Klein
11-12-2025
“Mr Gilmer did a fine jon”
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 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!
'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.
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
Authority Brands is the leading provider of in-home services, building brands that support the success of franchisees as well as better the lives of the homeowners we serve and the people we employ.
