Serving Rockville and beyond
Air Conditioning Company Rockville
For all of your AC needs, Donmar Heating, Cooling & Plumbing is here to keep you safe and comfortable throughout the year. As a local air conditioning company, we understand the importance of quality cooling services, and we are dedicated to meeting your needs—and your budget.
Air conditioning systems can easily last for 10+ years, but only with proper maintenance. Donmar Heating, Cooling & Plumbing services, repairs, and installs cooling systems with the level of expertise that keeps them efficient and operational. Addressing concerns like indoor air quality and energy efficiency, we the job done right so you can rest easier. When you’re choosing an AC company to deliver trusted service, on time, turn to Donmar Heating, Cooling & Plumbing.
Put your comfort in Donmar Heating, Cooling & Plumbing’s expert hands. Call (703) 457-8676 now to schedule an estimate!
Rockville AC Company Call for More Information Today!703-457-8676
Ibrahim is very knowledgeable, courteous, and gets the job done effectively and efficiently.
Avi Bender
S"Courteous, Friendly, and On Time"
They were courteous, friendly, and fully explained the work to be done.
Susan Edwards
R"Everything I Want in an HVAC Contractor"
Polite, professional, responsive, and informative.
Russ Shipman
R"Everything I Want in an HVAC Contractor"
Polite, professional, responsive, and informative.
Russ Shipman
D"Sean did a great job as always"
He kept me informed all the way through the process.
Dave Teal
D"Sean did a great job as always"
He kept me informed all the way through the process.
Dave Teal
J"Every Member of the Crew Was Superb"
The main technician, Edgar, and every member of the crew were absolutely superb.
Jack S
J"Every member of the crew was superb"
The work Donmar did was not simply a replacement; it was significant upgrades for the equipment, as well as correcting poor design.
Jack S
A"The system looks great"
The system looks great… temps in the house were toasty warm in an hour after installation.
Arellia Hinton
A"The System Looks Great"
The system looks great; temps in the house were toasty warm in an hour after installation.
Arellia Hinton
S"Mayer was excellent"
He was very professional, knowledgeable, and very quick to resolve the issue.
Seung
R"Very Diligent and Knowledgeable"
Chris was very diligent and clearly knew what he was doing.
Robert Tilton
S"Mayer Was Excellent"
He was very professional, knowledgeable, and very quick to resolve the issue.
Seung
R"Very diligent and knowledgeable"
Chris was very diligent and clearly knew what he was doing.
Robert Tilton
m"Prompt emergency service"
Very knowledgeable and experienced technicians.
m g
R"A Great Relief for Me"
Donmar sent someone out immediately who fixed it quickly and dealt with my difficult sister in a very understanding way.
Ronald Lee
R"A great relief for me"
Donmar sent someone out immediately who fixed it quickly and dealt with my difficult sister in a very understanding way.
Ronald Lee
m"Prompt Emergency Service"
Very knowledgeable and experienced technicians.
m g
C"Glad I switched to DonMar!"
The technician, Chris, was very professional, thorough, and personable.
Cindy Dall
C"Glad I switched to DonMar"
The technician, Chris, was very professional, thorough, and personable.
Cindy Dall
S"Very happy with the work"
The new furnace is functioning beautifully and is quieter than my previous 30+ year old furnace.
Sharon Cox
S"Very happy with the Donmar crew"
They were very professional and did an excellent job of cleaning up the area upon job completion.
Sharon Cox
D"Always High-Quality Service"
Always high-quality service. Honest assessments.
DH Dorsey
D"Always High Quality Service"
Always high quality service.
DH Dorsey
T"Provided Excellent Service"
They showed up on time, explained their work plans clearly, worked diligently, and were polite and respectful.
Thomas Dale
T"Excellent Service from Donmar Technicians"
They showed up on time, explained their work plans clearly, worked diligently, and were polite and respectful.
Thomas Dale
m"Chris is great, and so is Tracy"
They are friendly and helpful and do a great job.
mimi totten
m"Chris is great"
They are friendly and helpful and do a great job.
mimi totten
C"Charlie Is Always a Delight"
Charlie is always a delight to see.
Cheryl Sella
S"Exceptional Service"
Got new AC and furnace system installed by Donmar, and couldn’t be happier.
Sandeep Mahajan
Very knowledgeable and efficient
Ibrahim is very knowledgeable, courteous, and gets the job done effectively and efficiently. Glad I worked with this company.
Avi Bender
Courteous, Friendly, and On Time
Manuel and Edgar performed the service on my HVAC unit. They were courteous, friendly, and fully explained the work to be done. They came at the start of the scheduled window for the service, alerted me ahead of time when they would arrive, and completed the work within the 4-hour time that had been estimated. Everything was cleaned up at the end of the service.
Susan Edwards
Everything I Want in an HVAC Contractor
Recent furnace replacement. Everything I want in an HVAC contractor... polite, professional, responsive, and informative. Reacted quickly to our problem, clearly explained quoted options and prices, was on time for the work, completed work within schedule, and left the space cleaner than they started.
Russ Shipman
Everything I Want in an HVAC Contractor
Recent furnace replacement. Everything I want in an HVAC contractor... polite, professional, responsive, and informative. Reacted quickly to our problem, clearly explained quoted options and prices, was on time for the work, completed work within schedule, and left the space cleaner than they started.
Russ Shipman
Sean did a great job as always
Sean did a great job as always. He kept me informed all the way through the process. I like how Don Mar contacts me when it’s time for a spring and fall checkup. I like the new plumber service too.
Dave Teal
Sean did a great job as always
Sean did a great job as always. He kept me informed all the way through the process. I like how Donmar contacts me when it’s time for a spring and fall checkup. I like the new plumber service too.
Dave Teal
Every Member of the Crew Was Superb
The main technician, Edgar, and every member of the crew were absolutely superb. I had done a great deal of research, so I asked many technical questions. We are the original owners of this 2011 townhouse, and I watched it be built over several months. The work Donmar did was not simply a replacement; it was significant upgrades for the equipment, as well as correcting poor design and installation by the home builder. In every case, the installations/repairs were first rate.
Jack S
Every member of the crew was superb
The main technician, Edgar, and every member of the crew were absolutely superb. I had done a great deal of research, so I asked many technical questions. We are the original owners of this 2011 townhouse, and I watched it be built over several months. The work Donmar did was not simply a replacement; it was significant upgrades for the equipment, as well as correcting poor design and installation by the home builder. In every case, the installations/repairs were first rate.
Jack S
The system looks great
Mr. Edgar and his team arrived on time and ready to work. All I heard was hums and laughter in sub-degree temps. The system looks great. Temps in the house were toasty warm in an hour after installation. I was very concerned about this major investment, and it worked out great. Thank you, Donmar. Arellia, Silver Spring, MD.
Arellia Hinton
The System Looks Great
Mr. Edgar and his team arrived on time and ready to work. All I heard was hums and laughter in sub-degree temps. The system looks great; temps in the house were toasty warm in an hour after installation. I was very concerned about this major investment and it worked out great. Thank you, Donmar.
Arellia, Silver Spring, MD.
Arellia Hinton
Mayer was excellent
Mayer was excellent. He was very professional, knowledgeable, and very quick to resolve the issue.
Seung
Very Diligent and Knowledgeable
Chris was very diligent and clearly knew what he was doing. He did his very best to restore the operation of our furnace.
Robert Tilton
Mayer Was Excellent
Mayer was excellent. He was very professional, knowledgeable, and very quick to resolve the issue.
Seung
Very diligent and knowledgeable
Chris was very diligent and clearly knew what he was doing. He did his very best to restore the operation of our furnace.
Robert Tilton
Prompt emergency service
Prompt emergency service. Very knowledgeable and experienced technicians. Thank you, DonMar.
m g
A Great Relief for Me
I called from California to get help for my 86-year-old sister in Falls Church, VA, whose furnace failed during a terrible snowstorm with very cold temps. Donmar sent someone out immediately who fixed it quickly and dealt with my difficult sister in a very understanding way. A great relief for me.
Ronald Lee
A great relief for me
I called from California to get help for my 86-year-old sister in Falls Church, VA, whose furnace failed during a terrible snowstorm with very cold temps. Donmar sent someone out immediately who fixed it quickly and dealt with my difficult sister in a very understanding way. A great relief for me.
Ronald Lee
Prompt Emergency Service
Prompt emergency service. Very knowledgeable and experienced technicians. Thank you, Donmar.
m g
Glad I switched to DonMar!
I used DonMar for the first time, after a recommendation from a neighbor. The technician, Chris, was very professional, thorough, and personable. Their annual maintenance contract price is very reasonable. Glad I switched to DonMar!
Cindy Dall
Glad I switched to DonMar
I used DonMar for the first time after a recommendation from a neighbor. The technician, Chris, was very professional, thorough, and personable. Their annual maintenance contract price is very reasonable. Glad I switched to DonMar!
Cindy Dall
Very happy with the work
I was very happy with the work that the Donmar crew (Manuel, Edgardo, & Bryan) did on 1/15–1/16/26 to replace my HVAC system. They were very professional and did an excellent job of cleaning up the area upon job completion. When I pointed out to them that the new filter rack door was not completely aligned and that the door did not close securely, they were very responsive and got a new filter rack section—the door now closes tightly. The new furnace is functioning beautifully and is quieter than my previous 30+ year old furnace.
Sharon Cox
Very happy with the Donmar crew
I was very happy with the work that the Donmar crew (Manuel, Edgardo, & Bryan) did on 1/15–1/16/26 to replace my HVAC system. They were very professional and did an excellent job of cleaning up the area upon job completion. When I pointed out to them that the new filter rack door was not completely aligned and that the door did not close securely, they were very responsive and got a new filter rack section—the door now closes tightly. The new furnace is functioning beautifully and is quieter than my previous 30+ year old furnace.
Sharon Cox
Always High-Quality Service
Always high-quality service. Honest assessments and on time. Highly recommend!
DH Dorsey
Always High Quality Service
Always high quality service. Honest assessments and on time. Highly recommend!
DH Dorsey
Provided Excellent Service
The technicians from Donmar (Manuel and Eduardo) provided excellent service. They showed up on time, explained their work plans clearly, worked diligently, and were polite and respectful, cleaning up carefully before finishing. My wife and I were very pleased with the results.
Thomas Dale
Excellent Service from Donmar Technicians
The technicians from Donmar (Manuel and Eduardo) provided excellent service. They showed up on time, explained their work plans clearly, worked diligently, and were polite and respectful, cleaning up carefully before finishing. My wife and I were very pleased with the results.
Thomas Dale
Chris is great, and so is Tracy
Chris is great (and so is Tracy in the office). They are friendly and helpful and do a great job.
mimi totten
Chris is great
Chris is great (and so is Tracy in the office). They are friendly and helpful and do a great job.
mimi totten
Charlie Is Always a Delight
Charlie is always a delight to see. Thanks for sending him. The POV was very pleasant. Other work in my home.
Cheryl Sella
Exceptional Service
Exceptional service. Got new AC and furnace system installed by Donmar, and couldn’t be happier. Good price, excellent work, and responsive and pleasant customer service. This is the second unit I got installed by them in the past year — the previous was a heat pump. Highly recommend!
Paid in the form of check 6-8 weeks after installation. Donmar submits application on your behalf. $300 for Gas Furnaces with a minimum of 90% AFUE $400 for Gas Furnaces with a minimum of 95% AFUE $500 for Gas Furnaces with a minimum of 97% AFUE
$2,600 for Hybrid/Dual Fuel (Gas Furnace and Heat Pump) Systems with a minimum
furnace AFUE of 95%, 15.2 SEER2 and 7.5 HSPF2 $2,000 for replacement of Heat Pump and Evaporator Coil on a hybrid/dual fuel system
with a minimum of 15.2 SEER2 and 7.5 HSPF
Paid in the form of a check 6-8 weeks after installation. Donmar submits application on your behalf. $500 For Gas Furnaces with a minimum of 95.1% AFUEZ $700 For Gas Furnaces with a minimum of 97% AFUE
$400 for Energy Star Certified Tankless Wat
At Donmar Heating, Cooling & Plumbing, we deliver dependable HVAC and plumbing services across Virginia and Maryland. With over 30 years of experience, our team of NATE-certified technicians is committed to enhancing your home's comfort and energy efficiency. We focus on customer satisfaction through reliable service and green technology.
Why Choose Us:
30+ years of trusted service in Virginia and Maryland
NATE-certified technicians committed to quality
Carrier Factory Authorized Dealer
Transparent real-time updates with GPS tracking
Flexible financing and discounts for affordable upgrades
Emphasis on energy efficiency and green technology
Trusted for Over 30 Years
Providing expert HVAC services since 1990.
Energy Efficiency Focus
Save money with our green technology solutions.
Real-Time Service Updates
Track your technician’s arrival with GPS tracking.
Flexible Financing Options
Affordable upgrades with flexible financing solutions.
Answers to Your Top Questions
Why is my AC freezing up?
An AC can freeze due to restricted airflow, usually from a dirty filter, or low refrigerant levels. It can also happen if the evaporator coil is dirty or if the temperature is set too low. Regular maintenance can prevent these issues.
How often should my AC be serviced?
It's recommended to service your air conditioner at least once a year. Regular maintenance ensures your system runs efficiently, extends its lifespan, and can help prevent costly breakdowns. Typically, the best time for an AC tune-up is in the spring before the cooling season begins.
How long does an AC unit last?
AC units typically last 10 to 15 years with proper maintenance. Longevity depends on usage, climate, and how well the unit is maintained. Regular servicing can often extend the life of your system.
How can I improve my AC's efficiency?
To improve efficiency, regularly clean or replace filters, ensure your ductwork is sealed and clear of obstructions, and use a programmable thermostat. You should also keep your outdoor unit free of debris and ensure all vents are open and unobstructed inside your home.
Virginia Columbia Gas Rebates