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Thank you for your business and your loyalty to One Hour Heating & Air Conditioning® of Northern Virginia!

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Ashburn AC & Heating Repair Services

Trusted HVAC Repair in Leesburg, Ashburn & Northern Virginia

One Hour Heating & Air Conditioning® of Northern Virginia is dedicated to providing the best value and customer service in Ashburn, Leesburg and all throughout Northern Virginia. One Hour isn’t simply our company name; it’s a promise to value your time. We stand by our craftsmanship and products because your family’s comfort is our top priority. We respect and value our customer’s time, so we guarantee our HVAC repair technicians will arrive on time to address your heating and air conditioning needs: like our motto says, “Always On Time…Or You Don’t Pay a Dime.”® We offer a 100% satisfaction guarantee for up to two years after your heating or AC service.

We're Here for You, Whatever You Need

Whether you need routine maintenance, a heater replacement, or air conditioning repair, our team is ready to help. Our technicians are licensed, trained, and skilled to handle any AC and heating, regardless of how big or small. For your peace of mind, our technicians are background checked and drug-tested. When you hire our team, you can rest assured that we will provide you with high-quality work and excellent customer service. Reach out to our Ashburn HVAC team today for an estimate!

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

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

    “Our new four-panel system is perfectly suited to our needs, was reasonably priced and works like a charm. I especially like the interface they use that can show us power production in realtime and over the life of the system.”

    - Nick

    “Their equipment is first-rate, prices are extremely competitive and their service is top-notch. No reason to look elsewhere.”

    - G.B.

    “I will happily promote Modern Mechanical and their fine crews to my friends and neighbors and when I need my next upgrade I will call upon them once again without hesitation.”

    - Dave C.

    “We were more than impressed with the professionalism of this company and its employees. We need to replace the other a/c unit and without hesitation, we will be calling Modern Mechanical.”

    - Danielle W.

    “I called Modern Mechanical directly because the work they’ve done for me previously has been so terrific. Highly recommended to anyone needing a plumber in the NOVA area.”

    - Anne M.

    “The job was not an easy one given the complications of getting the condensate lines from the furnace to the outside compressor, but Modern Mechanical stayed late each day during the installation to make sure it was done right.”

    - Andrew N.
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  • Areas We Serve
    • Aldie
    • Alexandria
    • Annandale
    • Arlington
    • Ashburn
    • Berryville
    • Bluemont
    • Boyce
    • Bristow
    • Broad Run
    • Burke
    • Catharpin
    • Catlett
    • Centreville
    • Chantilly
    • Clifton
    • Delaplane
    • Dulles
    • Dumfries
    • Dunn Loring
    • Fairfax
    • Fairfax Station
    • Falls Church
    • Fort Belvoir
    • Fort Myer
    • Front Royal
    • Gainesville
    • Great Falls
    • Greenway
    • Hamilton
    • Haymarket
    • Herndon
    • Leesburg
    • Lincoln
    • Lorton
    • Lovettsville
    • Manassas
    • Marshall
    • Mc Lean
    • Merrifield
    • Middleburg
    • Millwood
    • Mount Vernon
    • Nokesville
    • Oakton
    • Occoquan
    • Orlean
    • Paeonian Springs
    • Paris
    • Philomont
    • Purcellville
    • Quantico
    • Rectortown
    • Reston
    • Round Hill
    • Ruby
    • Springfield
    • Stafford
    • Stephens City
    • Stephenson
    • Sterling
    • The Plains
    • Triangle
    • Upperville
    • Vienna
    • Warrenton
    • Waterford
    • West Mclean
    • White Post
    • Winchester
    • Woodbridge
  • Zip Codes We Serve
We may service additional communities. Please contact us for more information.
  • Inaugural Season 2019
  • Greater Reston Chamber of Commerce
  • Green Business Challenge Platinum
  • North American Technician Excellence
  • 2016 Best of Loudoun
  • Dave Lennox Premier Dealer - Lennox
  • Air Conditioning Contractors of America
  • Energy Star
  • Loudoun County Chamber of Commerce Membe
  • Diamond Contractor
  • EPA Certified Firm
  • Quote My Contractor - Certified Contractor
  • 2012 Best Places to Work - Business Journal
  • Goodman - A member of Daikin group
  • Inc. 5000 Logo
  • Navien NSS
  • Service Roundtable
  • Home Advisor Top Rated Badge
  • The Best of Ashburn 2020
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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.

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