Connect With Us
Please leave your information below and we will be in contact soon.
Gaithersburg, MD
Gaithersburg, MD
Bringing Comfort Home
With Expert AC 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 Knowledgable
4.8
Sandy Lochary
05-19-2025
“Mr Rojas check my air conditioner system he is good technician”
Susan Andrus
05-19-2025
“Mr Rojas worked good in my air conditioning system”
Two Peas
05-12-2025
“Gilmer Rojas arrived on time, performed a thorough inspection, and recommended & completed important maintenance on our HVAC system. I really appreciated Gilmer’s explanation of what needed to be done and why.”
Mike Sievers
05-08-2025
“You were hard worker and professional fixed and serviced my systems.”
Xiaofeng Hua
05-07-2025
“Gilmer Roras has done a good maintenance job and friendly. He took time to explain what needed to be done and why. I'm satisfied.”
Patti Connell
05-05-2025
“Very helpful No attitude Gave simple explanations”
Jim Kinkead
04-30-2025
“Rojas did a nice job.”
Brian Paulus
04-25-2025
“Mr Roja excellent job”
Ken M
04-22-2025
“Mr Rojas was a great technician. Very detailed in explaining and patient. 4 stars only because I wish he would have cleaned up after himself (dust) and replaced the tape around our system better as there is air not seeping through and wasn’t before he removed it .”
Edward Burman
04-17-2025
“The technician was very professional and polite he took the time to explain everything he was doing and explained the recommendations”
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.
0% 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
Monday
9:00 AM - 5:00 PM
Tuesday
9:00 AM - 5:00 PM
Wednesday
9:00 AM - 5:00 PM
Thursday
9:00 AM - 5:00 PM
Friday
9:00 AM - 5:00 PM
Saturday
Closed
Sunday
Closed