Donmar Heating and CoolingHVAC Services in Sterling
Donmar Heating and Cooling specializes in Carrier HVAC installation, repair, and maintenance. Proudly serving Sterling and the surrounding areas, we deliver reliable, certified HVAC solutions to meet your home's needs. As your local Carrier Factory Authorized Dealer, your satisfaction is our number one priority. That's why we stand behind our work with a 100% satisfaction guarantee. Equipped with NATE-certified technicians, we strive to exceed your expectations, whether performing routine maintenance or installing a new Carrier heating and cooling system.
Experience and Certifications
Past President's Award Winner
The Carrier President's Award is Carrier's highest dealer honor. We have received the award within the past three years. It recognizes us as a Carrier Factory Authorized Dealer who exemplifies leadership, management, customer satisfaction, expertise, business growth, and operational excellence.
Factory Authorized Dealer
As a Carrier Factory Authorized Dealer, we have met Carrier's highest standards for superior skills, service, and we proudly offer a 100% satisfaction guaranteed.
NATE Dealer
North American Technician Excellence (NATE) is the leading certification program for HVAC technicians and is the only test supported by the entire industry. We are proud to employ NATE certified technicians.
Financing Available
We offer flexible financing options for your new Carrier product or system. With approved credit, you can enjoy convenient monthly payments, competitive interest rates, and online bill pay.
Cool Cash
We participate in Carrier Cool Cash rebates. With the support of Carrier, during select times of the year Cool Cash rebates might be available when you purchase a qualified Carrier heating and cooling system.
Puron Advance Trained
Carrier demonstrates its commitment to going beyond the minimum with a refrigerant that easily surpassed the EPA’s lower Global Warming Potential (GWP) requirements for 2025. We have shown the same commitment through Puron Advance™ training.
Consumer Choice
We participate in Carrier’s Consumer Choice Warranty program and are authorized to offer a choice of factory warranty options on eligible Carrier-branded equipment.
HVAC Repair and Installation Services
Air Conditioner Repair & Service
We specialize in fast, reliable air conditioner repair and service to keep your home cool and comfortable. Whether it’s a minor fix or a major repair, we're here to ensure your AC runs smoothly when you need it most.
Furnace Repair & Service
We provide expert furnace repair and service. Our skilled technicians are ready to quickly diagnose and resolve any issues, keeping your home warm and comfortable year-round.
HVAC System Installation
We provide expert HVAC installation to keep your home comfortable year-round. Whether you're replacing your current system or installing HVAC for the first time, we'll help you choose the right solution for your needs and handle the installation with precision and care.
HVAC Maintenance
We offer annual HVAC maintenance to keep your system running efficiently and help prevent unexpected breakdowns. Through a thorough inspection and tune-up, we ensure your heating and cooling system is ready to keep you comfortable all year long.
About Donmar Heating and Cooling
Trusted HVAC Professional in Sterling
Leave a ReviewCarrier.com Reviews
4.92 out of 5(75 reviews)
Excellent product installation
I am happy with the service provided by this dealer
Laurina
-
May 21, 2025
Verified Purchase
Expertise:
5
Solve Problems:
5
Service:
5
Donmar
We have been working with Donmar for over 30 yrs and very happy with them. We can always get an appointment in a reasonable time frame.
Cinde
-
May 06, 2025
Verified Purchase
Expertise:
5
Solve Problems:
5
Service:
5
Excellent Customer Service!
We have used Donmar to install new AC, HVAC, and a tankless water heater in our home. They have also conducted emergency plumbing repairs, etc. They are always professional, on time, and have reasonable pricing. We highly recommend them!
Reynaldo
-
May 02, 2025
Verified Purchase
Expertise:
5
Solve Problems:
5
Service:
5
Replaced old hvac in one day
I have used Donmar for many years anf am very pleased with their service.
Tauheed
-
March 27, 2025
Verified Purchase
Expertise:
5
Solve Problems:
5
Service:
5
Competitive pricing, quick service, and sloppy execution.
Ham fisted installation demonstrating little attention to detail. See my Google review. Disappointing.
Patrick
-
March 10, 2025
Verified Purchase
Expertise:
2
Solve Problems:
2
Service:
2
Exceptional service.
This company provides exceptional service . Very impressed with their professionalism, expertise, and attention to detail. Great customer service. Their pricing was also reasonable. Highly recommend!
Anne
-
June 09, 2024
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Wonderful experience
When the estimator saw that I had no heat he contacted someone in the office who said a team could come out the next morning. They did exactly that, installing a new heat pump/heater/AC controlled with a nice smart Ecobee thermostat which I can control through my Amazon Alexa system, plus they also installed a new water heater as it was original with the house (40 yrs old). They did some things I hadn't seen before like using sheet metal to create 'pans' under the HVAC and water heater in case there's ever a water leak problem in the future. I also needed them to fix a problem I had with my A/C water discharging right onto my outside wall. They figured out a way to do that without cutting open my finished ceiling which I really appreciated. There are some top level cabinets in my basement which give access above the ceiling and they threaded and secured copper pipe through those, made a 90 degree angle to then thread the pipe to the outside, far enough past my back wall that I don't need to worry about water and mold problems anymore. The only issue I had was that they accidentally installed the enhanced Ecobee thermostat instead of the premium model. I left a message on Saturday and got a call back within an hour (wasn't even an emergency), and they've since come back to my house and replaced the thermostat with the better model. All in all I've been very happy with DonMar and wouldn't hesitate to recommend them to others.
Ron
-
April 12, 2024
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
wonderful
wonderful
Demetra
-
April 11, 2024
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Superior Dealer
Experienced technicians who go beyond contractual obligations to satisfy customers with quality workmanship. Donmar is our partner in all our future HVAC sales and service
Rao
-
March 27, 2024
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Highly recommend
Great service, detail oriented, long time customer. I would definitely recommend to anyone!
Elena
-
March 01, 2024
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Excellent service
Exceptional installation team.
Dennis
-
March 01, 2024
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Probably
New Heating \& Cooling installation should have come with a Thermostat,But I replaced it at my Cost of $195.1\-30\-24.
Shaheen
-
January 31, 2024
Verified Purchase
Expertise:
5
Service:
4
Excellent
Very professional and helpful
Khalil
-
January 11, 2024
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Urgent Install Exceeded All Expectations;
Lifesaver in the dead of winter to install a new unit the next day.
Patrick
-
December 16, 2023
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Great Experience
My experience with Donmar Heating and Cooling exceeded my expectations. The technician, Edgar was very experienced, professional, and knowledgeable. Edgar was very polite and encouraged my feedback as we discussed the particulars of the install and how best to accomplish same. Donmar assisted with moving heavy objects when necessary to facilitate the installation. Donmar was very respectful of my property and cleaned up very thoroughly when the job was completed. Donmar arrived on time on the scheduled date and completed the work timely. The price was fair, and I was more than satisfied with the process from beginning to end. I have used Donmar in the past and will continue to use them going forward. I have in the past and will continue to recommend Donmar to friends and family.
David
-
December 09, 2023
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
professional and knowledgeable service
Very personable and provided excellent explanations
Richard
-
November 27, 2023
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Professional
Fast and Professional!
Ravi
-
November 23, 2023
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Terrific all around good old-fashioned service often lacking in general in modern times
Prompt in responding to referral inquiry. Fair estimates regarding the scope of needed service. Timely in scheduling estimate and follow\-up Installation team arrived well during the 2\-hour window; courteous, professional, friendly, informative, respectful of the property inside and outside, and dedicated to completing the work well. Donmar, from the initial interaction remained aboveboard throughout the process.
Yvette
-
November 08, 2023
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Excellent instillation of a quality product
I received bids from four companies and chose Donmar because they provided the best balance of price and service. I was very pleased with the instillation as Bryan and Carlos took obvious pride in their work and included extra electrical work that I was not expecting. The heat pump has worked flawlessly and runs much quieter than the previous unit.
Davi
-
August 12, 2023
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Donmar Heating and Cooling is a top notch company. Everyone I worked with was professional, knowledgeable and thorough. They walked me through the entire process, communicated clearly and timely, and answered all of my questions.
The people at Donmar know what they are doing! Totally professional and easy to work with.
Sharon
-
March 29, 2023
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Recent service by Donmar Heating and Cooling
Professional service
Andy
-
March 22, 2023
Verified Purchase
Expertise:
4
Service:
4
Solve Problems:
4
Easy install and quality product
Donmar provided the highest quality unit for the lowest price when my 17 year old system died. No issues with install, scheduling was on my time and they were not late. No issues with the system so far so I strongly recommend them.
Michael
-
February 27, 2023
Verified Purchase
Expertise:
4
Service:
4
Solve Problems:
4
Professional and Dependable HVAC Company
I have used DONMAR Heating and Cooling for 8 years. They have always been responsive to our smallest and biggest needs. Their services are First Class, their advice is accurate and very helpful, and their equipment installations at efficient, quick, clean and right on budget/estimate.Having a company like DONMAR available for routine and emergency needs provides a great sense of security.
Mike
-
January 19, 2023
Verified Purchase
Expertise:
5
Service:
2
Solve Problems:
5
Excellent service!
Donmar provides excellent service and thehave highest expertise in Northern Virginia. They also clean up after themselves and wear shoe covers in the house.
Annette
-
November 03, 2022
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Recommend Donmar Heating and Cooling
Prompt, courteous, and professional.
Earl
-
October 18, 2022
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Almost perfect
Installed new furnace, didn't connect A/C correctly. Called two days later and they came out and fixed wiring connections.
Anthony
-
October 18, 2022
Verified Purchase
Expertise:
4
Service:
5
Solve Problems:
5
Fantastic experience
Donmar and all the technicians were so completely helpful! They were great at diagnosing the problem and the installation of then new system was very smooth.
Kimberly
-
October 16, 2022
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Above and Beyond
Our technician was super cordial and knowledgable
Curtis
-
June 21, 2022
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Super Job Done
I am so glad that we found and worked with this company. They made the job look easy. They solved the problem where another company said impossible. We cannot say thank you enough.
Jing
-
June 18, 2022
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Excellent Experience
In addition to excellent technical expertise, they are honest. Initially, Carrier sent a damaged product and Donmar told us it was damaged and they returned it and ordered another one. They are reliable, courteous, and respectful of the customers property. They provide floor coverings and wear foot coverings to protect your home).
Annette
-
April 04, 2022
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Simply the best.
The installers went above and beyond the call of duty. Just excellent in every regard.
Barry
-
March 09, 2022
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
REVIEW FOR DONMAR INSTALLATION OF HVAC (on 13 Dec 2021) at 1028 N. Liberty Str., Arlington, Va. 22205
100% Professional Service.
Kathy
-
December 15, 2021
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Great job installing HVAC system
Donmar Company did a great job installing a new HVAC system in my home. They were quick and very professional. I highly recommend their service.
Chris
-
August 13, 2021
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
New basement Ac and Gas furnace
Donmar team did a great job installing a new AC and Gas furnace. Edgar took time to carefully explain new thermostat functions. Very knowledgeable staff.
Phillip
-
June 18, 2021
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Donmar Heating and Cooling - Outstanding Installation Work
Installation of single\-family home system. Technicians were through, professional, and paid attention to detail; all my questions were answered. Could not be more satisfied.
Charles
-
June 17, 2021
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
New install
Excellent
Susan
-
June 17, 2021
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Great service
Installation went without any problems And according to schedule We received detailed explanation
Galina
-
April 27, 2021
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Great Service
High quality service. The new HVAC install went great. Great communication and very responsive to customer needs
Jonathan
-
April 22, 2021
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
A+
Edgar was great. Very polite, professional, and explained everything perfectly. Highly recommend.
Adam
-
April 08, 2021
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Fast and professional
Donmar was able to remove my old system and install the new system within one day, even though the location and size of the old system were difficult to manage. They were very professional and did not try to up\-sell me on unnecessary add\-ons
Michael
-
February 11, 2021
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Donmar did a great job, on short notice, at a fair price.
great Tech's \- knowledgable and helpful!
Tom
-
January 26, 2021
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Great Service
Great, reliable company! They came and replaced an air handler the next day with excellent service! Careful , clean, considerate of owner's property. I highly recommended and I will never call another A/C company again!
Elena
-
December 21, 2020
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Wonderful Experience
Great service. Edgar came to my house to install the new system. He was wonderful: courteous and explained everything, answered all of our questions before, during and after the installation.
Martin
-
December 14, 2020
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Great Service
Excellent service! I highly recommend this company
Chang
-
November 24, 2020
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
DON MAR COMPANY
Don Mar has always responded quickly to my service issues. The tech, Javier, who installed my Carrier furnace and air conditioner was great! I have confidence in him and he's always able to resolve/solve a problem. I am very pleased with this HVAC company.
Patricia
-
November 24, 2020
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Donmar Heating and Carrier: Good Experiences.
We have been dealing with Donmar in two homes over the past 15 years and have always had good experiences with their professional staff. This installation was no exception and neither was the one several years ago when we had to replace our attic heat exchanger. Both were change of equipment to Carrier and we couldn't be more pleased.
George
-
October 05, 2020
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Installation of new heat pump for AC.
Professional and Efficient!
Robin
-
October 05, 2020
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
HVAC Replacement
The technicians arrived on time and started installation immediately. They finished around 4PM without any issues. They are absolutely professionals.
Ramoncito
-
October 04, 2020
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Very Professional
They are very professional. Diagnosed the problem, presented options and then tackled a tough job very professionally. They covered the entry way, stairs and floor with tarps to make sure there would be no damage in removing the old unit.
George
-
August 25, 2020
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Replace Older HVAC System
I have been a customer of Donmar for 1.5 years (mostly service). They have been excellent. Now I have had them replace my entire system. Again excellent work.
Robert
-
August 22, 2020
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Outstanding Service!
Great service by Donmar. Completely satisfied. Professional, competent, cordial. Great experience. Very pleased.
Brian
-
July 23, 2020
Verified Purchase
Great
Highly Recommend
Scott
-
July 20, 2020
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Excellent service from Donmar Heating and Cooling
Great experience all around with staff and the service they provided from initial visit with estimate, follow\-up with email and phone calls, and installation of both new A/C and gas furnace. Will highly recommend this company to everyone I know.
Candy
-
July 06, 2020
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
DONMAR
Needed a new unit "now" and they were the only dealer that could respond in a very timely manner. Washington Checkbook had their 4\-star listing.
Alfred
-
June 24, 2020
Verified Purchase
Expertise:
5
Service:
5
Great Experiece With Donmar
Very professional. On time. Worked well on a very hot day. Delivered as promised. Thanks.
Jack
-
June 23, 2020
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Carrier System Installation
Extremely knowledgeable, considerate, and professional. We experienced no problems whatsoever and the installation was seamlessly performed. Highly recommended.
Kevin
-
June 08, 2020
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
HVAC Replacement
Fair pricing, Ease of scheduling, Technicians were on time, respectful of COVID precautions and did an outstanding job. Follow\-up questions were addressed courteously and promptly. We will use Donmar for our future heating and cooling needs.
David
-
June 07, 2020
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Great service
Fast, good and reliable service.
Darlene
-
March 30, 2020
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Happy customer... great HVAC system... nicest installers/technicians
I was sick with worry about the expense and the installation was complicated due to this being a condo and a very old building with tricky plumbing involving domestic water (Triple State) and mechanical water (Noyes NAC). But the Donmar folks were skilled at working with these other folks. Edgar in particular is outstanding... Such a nice person and made me feel confident the job would be done correctly.
Lisa
-
February 28, 2020
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Very satisfied
Donmar technicians were on time, very courteous, knew their stuff, and cleaned up after the job.
Bob
-
February 07, 2020
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Heat & Cooling
Awesome company, service and staff
Joseph
-
November 21, 2019
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Install
Consummate professionals! Will continue to recommend their services. Experts in their field of industry. Thank you!
Sophia
-
November 15, 2019
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Fast, Professional, and Friendly
The crew installed 2 units in less than 6 hours. All were very knowledgeable and friendly. Couldn't be happier.
Joe
-
August 15, 2019
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Professional & Reliable Company
Prompt service and excellent care! Provided us with options and allowed us the opportunity to make an educated decision! Will continue to be a customer for many years to come!
Sophia
-
August 02, 2019
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Donmar plumbing
This is the second home at which Donmar plumbing has installed a Carrier system. This job was complex and during a heat wave. Donmar plumbing was incredible and conducted a great installation.
Jonathan
-
July 28, 2019
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
DonMar Company Heating & Cooling
Great experience overall with DonMar Company Heating \& Cooling
Jeff
-
July 25, 2019
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
quick and professional
very quick turn around. installers were very professional and did a wonderful job.
G
-
July 20, 2019
Verified Purchase
Refreshing that customer service still exists!
Javier and Rob were punctual, respectful of the house, and very thorough. It was impressive they never seemed irritated by my endless of list of questions and tendency to follow them around trying to learn something.
Krystal
-
July 06, 2019
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Excellent installation
Nicely done
Clifford
-
June 01, 2019
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Excellent service
Technician was very professional and polite.
Dennis
-
May 03, 2019
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
HVAC techs installed new dual-zone Carrier systems, these guys are great!
Javier (Lead), Robert and Carlos came to our place around 8am to install 2 Carrier Comfort 14 SEER\-rated HVAC systems along along air handler/coil system replacement, very professional and courteous, all finished by 4pm. They were very transparent in what they were doing and gave me the briefing for the work done, certain things to keep up with, includes a 1 yr service contract and they filled out the registration paperwork and submitted for the warranty coverage. I definitely recommend them!
Nick
-
April 30, 2019
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Excellent
The installer was very polite and knowledgeable
Sherry
-
April 27, 2019
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Organized and Efficient!
I?m so happy we chose to get our HVAC system changed with Donmar. They made it easy by answering questions in a way I could understand and explaining the process. My technician Javier was incredibly professional, on time and took time to answer more questions we had about the system. I?m very impressed with Donmar and they have gained me as a loyal costumer.
Eliexer
-
April 26, 2019
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Donmar, fair and professional
Have used Donmar for more than 26 years!
Rodrick
-
April 24, 2019
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
Job well done
Technition was very polite and experienced.
David
-
February 12, 2019
Verified Purchase
Expertise:
5
Service:
5
Solve Problems:
5
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