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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.”

    “We've used One Hour Air Conditioning & Heating for a number of years now and have always been satisfied with the work performed by their service personnel. This is the first time that Larson has ...”

    - Robert W.

    “Austin and team were extremely professional and efficient. We’ve been using One Hour for many years and have always been very satisfied with the service. The team always does a great job and ...”

    - Vernessa P.

    “I am very happy with this company, I look forward to doing many years of business with them. So far each employee has treated my home as if it was their own. In this day and age that kind of pride in ...”

    - Josh P.
  • Areas We Serve
    • Boring
    • Damascus
    • Freeland
    • Glyndon
    • Hampstead
    • Lineboro
    • Manchester
    • Mount Airy
    • New Market
    • Parkton
    • Towson
    • Upperco
    • Westminster
  • Zip Codes We Serve
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