Virginia & Maryland Heating & Air Conditioning
Experiencing HVAC Issues? NATE Certified and Dedicated to Your Safety and Comfort

Expert Sterling HVAC Repair Services

Call Donmar Heating & Cooling for a Quote

Having reliable heating or cooling in your home is not just about indoor air quality and comfort – it’s also about safety. Our NATE Certified HVAC experts can diagnose any type of HVAC issue and apply a cost-conscious, effective, and energy efficient remedy within your budget and timeframe. Whether your unit has frozen due to cold temperatures, is not running efficiently, or is creating frequent temperature changes, we can address the issue and help resolve the problem right away. We proudly serve residents in VA and MD.

What makes our Sterling HVAC repair team the right choice for homeowners in Northern Virginia and Maryland:

We’re proud to be a Carrier Factory Authorized Dealer, which means we’ve met high standards of customer satisfaction and technical excellence. Most of our technicians are NATE certified, which means we are fully qualified to service and repair all makes and models of HVAC equipment. As one of our area’s top HVAC contractors, we are committed to maintaining the same high level of service that earned our factory authorization in the first place.

Offering Transparent Prices So You Always Know What You’re Paying for

In some rare cases, constant repair costs than actually end up exceeding the cost of replacement. As HVAC technicians in Sterling and serving Northern Virginia and Maryland, we are always upfront and honest about our prices, and our technicians always work on flat rates for your peace of mind. Because we pride ourselves on transparency and customer satisfaction, we will be honest and thorough in our diagnosis of your HVAC problem. If a unit replacement would be more cost-conscious for your current situation, we will inform you of all options we can possibly take to remedy your indoor air problem.

We have a wide range of repair services include:

Have an HVAC emergency? Are you in need of one of our NATE Certified Technicians immediately? We proudly offer emergency services 7 days a week. We would be happy to come out to your home and assess the situation hassle-free. We service a wide range of areas throughout Northern Virginia and Maryland.

Contact Donmar Heating and Cooling in Sterling, VA at (703) 457-8676. We offer competitive service maintenance agreements and Special Financing Options with Approved Credit.

Don't Just Take Our Word for It!

See What Our Customers Have to Say About Our Service
  • “Really appreciate your crew. They answered all my questions and concerns, and the work appears to be impeccable!”

    Jeffrey N.
  • “This company is very attentive to the customer and respond to their concerns quickly.”

    Natalie M.
  • “We've been pleased with the units, but its your employees that have made the real impression - they've been uniformly fantastic!”

    Kathleen
  • “It is so hard to find a trustworthy AC repair company and I think i have finally found it.”

    Rodrigo
  • “Your customer service is outstanding and everyone that I spoke to or met in person speaks to the nature of your company.”

    Kathy
  • “They are honest and straightforward with their recommendations and always give us various options. ”

    Samia K.
  • “Great company — replaced my furnace very efficiently and effectively. ”

    Chris C.
  • “Donmar Company defines customer service excellence to a higher level.”

    Scott H.
  • “I am thankful for Paul’s service and HIGHLY RECOMMEND Donmar Company to anyone with an HVAC issue!”

    K.J.

Creating Happy Customers Since 1990

Why We Are the #1 Trusted HVAC Company in Northern Virginia
  • Emergency HVAC Services 7 Days a Week

  • NATE Certified Technicians

  • Offering Free Estimates On Replacements

  • Flexible Financing Options

  • Quality Service With Honest Values

  • Affordable Service Management Agreements

  • Over 25 Years of HVAC Experience

  • We Are On Time, Every Time