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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
Whitney Gordon
03-13-2026
“Mr Gilmer was working good in my system”
Robert Espejo
03-10-2026
“Josh was excellent! Explained everything in detail.”
Lillian Soto
03-10-2026
“awesome work!”
Chris Wampler
03-06-2026
“Mr Gilmer was very knowledgeable and thorough with each unit. You can tell he has been doing this for many years.”
Rodger Stenger
03-05-2026
“Gilmar and William explained everything in detail and gave a good overview of what was needed. They were on time and efficient. I highly recommend!”
Maria Simon
03-03-2026
“Mr Gilmer”
Patrick Smith
03-02-2026
“Mr Gilmer and William were great!”
Amy Carson
02-24-2026
“Mr Gilmer and William came to check and they were very friendly and knowledgeable. We had a very good experience with them. They checked everything and answered all my questions.”
Adam Fekete
02-24-2026
“Mr. Gilmer, and his trainee William came out serviced my system took plenty of picture to review things with me, great experience overall”
James DeGraffenreidt
02-20-2026
“Mr Gilmer and William”
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.
