Virginia & Maryland Heating, Air Conditioning & Plumbing
Repair and Installation Your One-Stop Shop for Everything HVAC!

Sterling Air Conditioning Services

Donmar Heating & Cooling Serves Maryland & Northern Virginia

To beat the sizzling summer heat in Virginia, our friends and neighbors depend on great air conditioning. At Donmar Company, we know how important it is to stay cool throughout the year, and we offer great Carrier air conditioners and outstanding customer service to keep your family comfortable and safe. We are the Sterling area’s one-stop air conditioning experts with a more than 25-year track record of successful projects and satisfied customers.

AC Installation

Every home’s cooling needs are unique, and the key to breathing easy is picking out a system that meets those cooling needs precisely. Over and under-sized systems run less efficiently and are subject to more wear and tear than properly sized systems. That is why we start every installation project with a full load calculation to assess your home’s cooling load, accounting for square footage, layout, and load-generating appliances. With the results in hand, we will then work with you to pick out a system that is perfectly sized to fit your home.

As a Carrier Factory Authorized Dealer, we’re fully familiar with all of the manufacturer’s specifications, and we look at those requirements as an absolute minimum. Our technicians work tirelessly to make sure that every system we install meets or exceeds Carrier’s standards. At the end of the installation project, you will be all set with an efficient, powerful air conditioner that will keep your home cool for years to come!

AC Repair & Emergency Repair

When your air conditioner shuts down in the middle of the summer, it’s not just a comfort issue – it’s a safety issue. Our Sterling, VA AC repair company believes that repair work is a cornerstone of our business, and we take this responsibility to customers very seriously. Our Sterling, VA AC repair team is available 24 hours a day, and we respond to every service call in vans loaded with parts and equipment. We are proud to say that we can complete most repair projects in a single visit!

Prevent Problems With Regularly Scheduled Maintenance!

Of course, the best approach to air conditioning issues is to prevent them from happening in the first place. We offer comprehensive annual service agreements to diagnose any small, emerging problems and deal with them before they become major problems. However, great maintenance is about more than just preventing issues.

Our Sterling, VA AC repair technician will also make the small calibration adjustments needed to maximize energy efficiency and lower your monthly utility bills. In short, a maintenance agreement is an investment in the future of your home.

Put Your System in the Hands of the Professionals!

All of these great services start with great technicians. Most of our staff hold NATE certification, the HVAC industry’s premier credential. NATE-certified contractors are familiar with all makes and models of air conditioners and have the training and experience needed to diagnose and repair issues consistently. When you call our Virginia and Maryland HVAC team for an air conditioning repair or maintenance job, you can rest easy knowing that your system is in good hands.

Contact our office in Sterling, VA now at (703) 457-8676 or 301-250-1899 (Maryland) for a free estimate!

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

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

    Samia K.
  • “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.”

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

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

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

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

    Natalie M.

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