Virginia & Maryland Heating, Air Conditioning & Plumbing

A Note From Donmar Company About COVID-19

To Our Valued Customers,

We recognize that with the constantly changing COVID-19 situation in our country and around the world, this is an unprecedented time for everyone. With all the uncertainty, we want to let you know that we are here for you, and let you know about the precautions we are taking to keep our technicians and you and your family safe.

  • Our technicians will wear gloves, facemasks, and booties at all times while working, and stay in the work area unless its necessary to move around the home.
  • We will refrain from handshakes and adhere to social distancing
  • To minimize hand to hand transactions with the technicians, we have a payment tab available on our website, or you can call the office at anytime to process a payment for services rendered
  • Our technicians have sanitizing wipes stocked on their trucks, and will use it prior to entering your home
  • If any of our employees are showing any signs or symptoms of being sick, we will keep them home without hesitation

If you have any suggestions or can think of anything else we can do as a precaution, we are happy to listen. We will continue working so that your home is a source of comfort to you, and so the air quality is clean and safe. Again, the safety of our technicians, you, and your family are our number one priority.

Please be safe and stay healthy.


Donald Wills


Donmar Heating, Cooling, and Plumbing

Text us some photos of your HVAC or Plumbing project we’ll send you an estimate! CONTACT US NOW

Heating, Air Conditioning in Sterling

Serving Homeowners Throughout Northern Virginia & Maryland Since 1990

At Donmar Company Heating & Cooling, we have always been committed to giving our customers the best heating, AC & plumbing service, always tailoring our approach based on your home, your budget, and your needs. Our Sterling HVAC technicians and plumbing experts combine excellent workmanship with a steadfast devotion to total customer satisfaction to create consistently exceptional results. That’s what we call the Donmar Company difference!

When it comes to your home, we strive to help create a controlled climate year-round. We only carry the industry’s best technologies and our NATE Certified technicians are fully trained in the most cutting-edge installation practices. We’ve created a 30-year legacy of customer service and satisfaction, always providing the top-notch service you have come to expect from our team.

You Know Exactly Who is on Their Way & When!

In order to provide you with peace of mind, we utilize technology that allows our customers to see who's coming and their exact ETA, all with GPS tracking! When you set up a service call, you'll receive a notification of which technician will be helping you (including a photo of them). There's never any guesswork and you won't be left in the dark on which technician will be arriving to your home and when, because it is all displayed to you in real time.

Creating Happy Customers Since 1990

Top Rated HVAC & Plumbing Company in Northern Virginia

Finding an HVAC and plumbing company you can trust can be pretty difficult. That is why Donmar Heating, Cooling & Plumbing is committed to offering prompt, affordable service on your schedule. We proudly offer a range of flat-rate fees and financing options with approved credit. Our services are second to none. We proudly feature energy efficient HVAC systems and water heaters that are friendly on the environment, as well as your monthly energy bills.

Our plumbers and technicians have years of experience and can determine a solution based on your needs, your home’s specifications, and most importantly, your budget. We know that you want a comfortable home all year long, so we make sure every repair or installation is executed to your complete satisfaction.

It's more than just about comfort –
it’s about having peace of mind.

  • Emergency Services 7 Days a Week
  • NATE Certified Technicians
  • Offering Free Estimates On HVAC Replacements
  • Flexible Financing Options
  • Quality Service With Honest Values
  • Affordable Service Management Agreements
  • Over 30 Years of Experience
  • We Are On Time, Every Time

Our Commitment to Excellence

  • President's Award 2021
  • Best Plumbers in Rockville
  • ACAA Member
  • Carrier
  • CFAD

Don't Just Take Our Word For It!

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


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

    Chris C.

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


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


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


  • “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.

  • “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.

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