Heating & Cooling Services for Harford County & Surrounding Areas

100% Satisfaction guarantee!

As the leading HVAC service provider in MD and throughout the United States, we proudly serve communities from coast to coast—bringing expert service and peace of mind to homes throughout your area. %{location_name} is based in Bel Air and provides expert heating and cooling services to residents in Harford County and the surrounding areas.

Check out our complete service area map below. If you’re still unsure whether we service your address, give us a call at (301) 321-7231.

Two One Hour Heating & Air Conditioning technicians standing confidently in front of a service van.

Heating, AC & Furnace repairs in Harford County

100% Satisfaction guarantee!

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.

HVAC Near Me In...

One Hour Heating & Air Conditioning® of Harford County services the following communities:

Aberdeen
Abingdon
Bel Air
Bel Air North
Bel Air South
Cardiff
Churchville
Colora
Conowingo
Darlington
Edgewood
Emmorton
Essex
Fallston
Forest Hill
Fork
Fort George G Meade
Havre De Grace
Jarrettsville
Joppa
North East
Perryville
Pylesville
Street
Whiteford

We Have a Reputation

For Being Punctual, Friendly and Knowledgable

4.8

(264 reviews)

Gerald Gionet

05-07-2025

“Brandon from one hour heating was attentive, professional and knowledgeable.”

Carlos Almeida

05-06-2025

“Excellent service. Quick response. Real gentleman. Found a simple fix to a problem where we thought we needed to replace the entire the unit. My wife felt immediate relief from the intense pressure of paying for an entire unit.”

Lynda Mcmillian

04-25-2025

“Im pleased with my services provided by Mr. Johnson.”

Prince Williams

04-13-2025

“My AC unit suddenly stopped working, and I was completely stressed. I made a phone call to One Hour Air Conditioning, and my problems were solved. My technician Brandon was Phenomenal. and he was kind, professional, and beyond knowledgeable. He explained everything to me and had my unit up and running. It wasn’t just a fix—it was relief, comfort, and peace of mind all at once. If you’re looking for AC repair done with heart, skill, and integrity, look no further. One Hour AC is the way to go!”

Diane Barrett

04-11-2025

“Thorough Explained what he was doing Courteous”

Julie Barausky

04-11-2025

“Chris and Elijah did a terrific job installing our new A/C unit and coil. The weather was definitely not cooperative but they managed efficiently and professionally. Thank you Chris and Elijah!”

Marjorie Cota

04-11-2025

“Brandon was great! Called ahead of time, was professional and was very knowledgeable!! Your lucky to have a great tech like him! 👏👍🙌🎉”

Sean Rogers

04-10-2025

“Brandon was very professional, knowledgeable and courteous. He was able to walk me through the issues he found, explain my options and complete my service quickly and effectively.”

eric buesgen

04-07-2025

“As always great Friendly service.”

Donald Coburn

04-07-2025

“Brandon is an outstanding professional and an asset I request him whenever he is available”

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