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Frederick, MD
Frederick, MD
Bringing Comfort Home
Frederick HVAC Services
One Hour Air Conditioning & Heating® of Frederick
4.9
Heating, AC & Furnace Repairs in Frederick, 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
4.9
Courtney Maxwell
01-22-2026
“First got work done with One Hour Heating & Condtioning 5yrs ago, back in 2021. They installed a new water heater and HVAC system. Highly professional, top notch service. Fast forward to January 2026 and I had an issue with the thermostat not working. I needed this issue taken care of ASAP because it was during the winter and it was extremely cold. Because of One Hour Heating & Condtioning’s professional techs and punctuality , it was only right that i contacted them again. And I’m glad I did. They sent someone out the very next day. The tech that came out was Josh Ramcharan. Josh had Exceptional customer service, he was polite , personable, easy to talk to and communicative. Josh identified the issue, explained the cause of it and walked me through how he would resolve it. In no time , Josh had the HVAC system back up and running! And the thermostat working as well! Thank you Josh ! and thank you One Hour Heating & Condtioning !!”
Derek Potter
01-14-2026
“Excellent service! I would certainly recommend their HVAC services. Thanks to technicians Josh & Derrick!”
Aziz L
01-05-2026
“Josh was consumate professional. He diagnosed our heating problem after thoroughly checking the system he then explained our options without pushing for the most costly. He aptly and expertly put our worries to rest. We'll gladly and confidently call on him again for any heating or air conditioning problems.”
Luisa Meade
12-08-2025
“Excellent service”
Helen S Avery
12-02-2025
“Damon arrived in the time frame I was given. Knew instantly what the problem was with the thermostat. He was very friendly and I felt comfortable having him in my house. I would request him again.”
Household Budget
10-21-2025
“Wonderful and timely service. Brandon is a gem!”
Trebreh Johnson
10-21-2025
“I had a great experience working with Tyler! He was super friendly, professional, and went above and beyond to help out. You can tell he really cares about his work and his customers. Highly recommend him!”
Antowan Bell
10-21-2025
“Fast and great work I will be coming back”
Danielle Austin
10-21-2025
“Tyler was super professional, and provided exceptional service. Great experience will definitely recommend him to friends and family! Thank you Tyler !”
Judi Bath
10-09-2025
“Tyler is an exceptional technician!”
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.
