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

Rockville, MD HVAC Services

Providing Our Maryland & Virginia Customers with Comfort & Clean Air

No matter what time of the year it is, you and your family deserve to breathe clean indoor air and remain comfortable in your home. At Donmar Heating & Cooling, we have made it our mission for more than 30 years to provide the best HVAC services to Rockville, MD so that this clean air and total comfort can be a reality. Whether you are in need of emergency repairs, want a professional team for regular maintenance, are looking to upgrade your current system, or anything in between, count on us!

Why choose us for your HVAC needs?

  • NATE-certified technicians
  • A+ Better Business Bureau accreditation
  • Quick response and same-day services
  • Emergency HVAC services
  • Mobile fleet of vans

Regularly-Scheduled Maintenance Services

One of the services that our Rockville, MD HVAC company often stresses is maintenance and tune-ups so that your system works effectively and efficiently during the year. When you have problems with your air conditioning or heating, it can be extremely frustrating, especially if you and your family’s comfort within the home are compromised. In order to keep these issues at bay and prevent damage that could require costly repairs, it is important to have regularly scheduled maintenance performed on your system by our certified and trained professionals.

Save Money on Energy Costs!

In many cases, all that is needed are a few minor adjustments in order to maximize your system’s efficiency. This ensures that you and your family will be as comfortable as possible during every season of the year. Not only do these small, calibrated adjustments increase efficiency, they can also ensure that your monthly utility bills will be lower. No matter what season it is, you’ll be living comfortably inside your home and saving money on your energy costs as well!

Our Technicians Are Ready to Handle Jobs of Nearly Any Size!

You can rest assured that every technician on our staff has attended a number of HVAC workshops and undergone rigorous training before they are ever sent out on a service call. We know how essential it is to have the right people for the job. That is why we only hire heating and air conditioning repair technicians that are NATE-certified. Our people are prepared to handle any problem, large or small, because they have been extensively trained to do so.

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
  • “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.
  • “Really appreciate your crew. They answered all my questions and concerns, and the work appears to be impeccable!”

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

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

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

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

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

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


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 with Approved Credit

  • Quality Service With Honest Values

  • Affordable Service Management Agreements

  • Over 30 Years of HVAC Experience

  • We Are On Time, Every Time