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Mount Airy HVAC Company

Heating & AC Experts Serving Frederick County, Montgomery County & Beyond

One Hour Air Conditioning & Heating® of Mount Airy has a long history serving the residents of Mount Airy, Frederick, Gaithersburg, and throughout the Washington DC area. We’ve been in business since 1949 and turned our focus to HVAC service in 1993. Our team has the same goal that we started with: making customers happy and comfortable through excellent heating and AC service. Every member of our team undergoes extensive training and is well equipped to solve any HVAC problem. Our vehicles are so well-stocked with parts that we can finish most jobs in one visit!

Why Maryland Customers Love Our HVAC Services

Even though we operate under the name of a nationally-recognized HVAC company, we’re a proud local business based in Mount Airy. Our team back all their jobs with amazing guarantees that make sure we’re always on time, and we always do the job right the first time. To be as transparent as possible, we also have a StraightForward® pricing guide so you’ll know the costs of all our heating and AC services before we perform them.

Always On Time... Or You Don't
Pay A Dime

We Have A Reputation For Being Punctual, Friendly, and Knowledgeable

    “Our tech Larson was amazing!! I am so glad we went with this company!! Originally we had Michael and Sons come to our house because they had the first available appointment that worked for family. Big ...”

    - Laylani K

    “One Hour of Mt. Airy really knows how to take care of their customers! I recently had to transition my maintenance plan from a different One Hour franchise to Mt. Airy One Hour and had an HVAC ...”

    - Dan Madey

    “Jonathan P. is the consummate professional. He wore his mask, completely explained the work being performed, and answered questions. I was very pleased with the service he provided.”

    “Air conditioning was out. Called and they came out a few hours later. Quick diagnosis and solution.”

    - Christopher A.

    “I appreciated the care Brian took to diagnose problems with two different systems - we found multiple issues and he objectively gave me options without trying to sell me anything. I had a lot of ...”

    - Lisa H.

    “My technician, Larson, is just great! Always on time, professional and personable! The office staff are equally as helpful and responsive. All around a great business to work with!!”

    - Rita G.
  • Areas We Serve
    • Boring
    • Damascus
    • Freeland
    • Glyndon
    • Hampstead
    • Lineboro
    • Manchester
    • Mount Airy
    • New Market
    • Parkton
    • Towson
    • Upperco
    • Westminster
  • Zip Codes We Serve
    • 20872,  
    • 21020,  
    • 21053,  
    • 21071,  
    • 21074,  
    • 21088,  
    • 21102,  
    • 21120,  
    • 21155,  
    • 21157,  
    • 21158,  
    • 21252,  
    • 21285,  
    • 21771,  
    • 21774
We may service additional communities. Please contact us for more information.
  • Google Guaranteed Partner
  • Heroes Club
  • Available 24/7 Blue
  • Air Conditioning Contractors of America
  • Energy Star
  • Better Business Bureau A+ Black and White Image
  • UWin Black Badge
  • PHCC Red Logo

Here for You Around the Clock

Our Comfort Specialists are available to help, no matter the time of day. If you're in need of emergency services, we've got you covered 24/7.

Part of the Authority Brands Family