Virginia & Maryland Heating, Air Conditioning & Plumbing
Make the Call for Comfort Your One-Stop Shop for Everything HVAC - In Gaithersburg, MD!

Gaithersburg, MD HVAC Services

Comprehensive & Customized Residential Solutions

No matter how extensive your heating or cooling needs are, our team at Donmar Heating & Cooling is ready to take up the challenge and exceed your expectations. With unmatched quality, same-day installation, a top-class product catalog, and a team of NATE-accredited technicians for you to benefit from, our services are simply unmatched anywhere else. We offer comprehensive installation, repair, and maintenance solutions customized to your needs, and are here to help you as soon as possible!

The Importance of Regular Preventive Maintenance for Your HVAC System

While our Gaithersburg, MD HVAC company provides a comprehensive range of services, which include repair and installation, we constantly stress the importance of preventive maintenance. By allowing us to perform regular cleanings, tune-ups, and minor repairs, you will not only increase the longevity of your system but prevent major, costly problems in the future. We offer regularly-scheduled service throughout the year to make sure that you are enjoying healthy, breathable, and comfortable air, no matter the season!

Regular preventive maintenance services can ensure:

  • A lower frequency of problems that will require repair and replacement
  • An increased lifespan for your HVAC equipment
  • A more energy-efficient space with lower utility bills

A Mobilized Emergency Repair Team Available 24/7

If your HVAC unit shuts down at anytime in the summer or winter, it is a safety issue, not just an inconvenience. Our Gaithersburg, MD HVAC technicians understand that fact, and that is why we are extremely oriented towards repair work and responsive service. To ensure that you have professional assistance when you need it, our emergency repair team is available 24/7 with fully-equipped mobile workshops to complete the repairs and replacements as quickly as possible.

Call us today in Virginia at 703.457.8676 or in Maryland at 301.250.1899 to request your HVAC service.

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

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

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

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

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

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


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