Since moving into our house in September 2020, we have replaced both A/C units in the house that was built in 1990. The upstairs unit stopped cooling Sept 5. On Monday, we found there was a leak. They found the leak in the evaporator coil which the standard cost for it was $1,378.30. We didn't pay that amount, but our total bill that day was $1,684.00. We find the Technicians are very knowledgeable in what they are doing at our house. They might be more expensive than other companies, but we have been very happy with them. Thank You Edgar C. and Javier V. Becky Bakley read more

I cannot say enough good things about this company! We had a leaking water heater tank that needed to be replaced as soon as possible. We had so many exceptional employees helping us getting this taken care of from beginning to end! Best of all? There were NO hidden fees, or drama! We paid exactly what they said we would, no more. We highly recommend this amazing company! read more

The time had come for us to replace our 24-year-old Carrier Infinity air conditioner. We decided to replace our 17-year-old Carrier Infinity furnace as well. We are so happy we did. After entertaining 3 quotes, we decided to hire Donmar Company. Its quote was competitive. It was comforting to know that Donmar is Carrier-authorized. This system is so quiet that you have to listen carefully to know that it is on. The Infinity System Control with WiFi is easy to use. Their head technician, Edgar, and his helper, Gus, arrived on time. The job they did was fantastic. We are very pleased with their work, their integrity, and their professionalism. They worked quietly, removed all trash and left the space clean. Edgar is most likely the very best technician around. His many years of experience shows. He explained everything, and answered all questions. When our 17-year-old Bradford and White water heater needs to be replaced, you can be sure we'll call for Edgar. read more

In early 2016 I purchased a high end Carrier Infinity System + Hot Water Heater from Donmar which cost over 10k. At the time I decided I wanted to use my Nest Thermostat instead of the Carrier Infinity Thermostat. They were fast an efficient getting the system installed and I was very happy, at least to start. One of the features I opted for was the whole house humidifier. Lets just say it wasn't working correctly and took I think 4 trips out to my house to fix it. First they moved the water line from the cold water to the hot water line (which I've since learned isn't a good idea because of mineral buildup). Then they came out and rewired the electrical junction box so it would stop shutting off. Then they came out and replaced the solenoid valve and lastly they replaced the humidifier pad. With the humidifier finally working I thought all was well, a year later I renewed my service contract with them and even refereed a co-worker to them who ended up purchasing a whole new system. After reading a lot of stuff online I finally decided I was going to swap out the Nest Thermostat for the Carrier one. I emailed Donmar to ask what it would cost to get one installed. The response I got was, "It's expensive. $879 installed- no discounts." So I asked what if I purchased one elsewhere and just had them install it, the reply I got back was there was a $150 rebate so it would really only be $729 installed (not answering my question). I then asked again if I purchased my own would they come install it for under $200, they could tie it in with the annual service they would already be coming out to do. I was told no and the cheapest they would do it for was $325, so I countered and asked if they would do it for $250. But the response back was they wouldn't budge on $325 cost just for the install. So just doing the math they wanted to charge me $729 for the thermostat + install which means the thermostat cost $404. That means they wanted to charge me $162 an hour in labor (assuming it took 2 hours to install) and they would have already had a tech at my house doing the annual maintenance. I bought a 10k system from them, referred a co-worker who also bought a very expensive system from them and I had renewed an annual maintenance contract with them and they wouldn't budge at all. Needless to say I found another Carrier Certified company who installed the Thermostat in 30 minutes and charged me $75, I am now using them for my annual maintenance and will not be recommending Donmar Company anymore. read more

If you want a proper HVAC installation, I highly recommend you get an estimate from Donmar Company. We got our furnace, air conditioner, and water heater replaced at the same time since they were getting old and a growing number of problems were appearing. It didn't make sense to spend more money trying to repair it. It was also obvious that the previous installer (hired by the previous owners of our house) cut corners and didn't even match the tonnage on the condenser and evaporator units. So, it was time to get a replacement. We ended up getting the Carrier Infinity system with zoning and the Infinity thermostat and zone sensor. Along with a UV light and humidifier. We also needed to get ductwork done, automatic dampers added, as well as rearranging some gas lines to our water heater and furnace. Having the zoning and 2-stage systems has made our multi level home more comfortable with even temperatures on each floor. We worked with Michael W. on the estimates and he was really helpful in answering all my questions in person and on the phone. I think he even came a few times during the installation to check on things. Edgar was the lead technician doing the 3 day installation and did a superior job. Wow, I was impressed with how good the install was! He was very detailed oriented and explained everything clearly along the way. I had a lot of questions and he answered them all. It was assuring that he has been with the company for a long time and has a lot of experience. The install by Edgar and other technicians was done really well. I did a ton of research on what to look out for, and how the install quality is more important than the equipment. Donmar uses a check list that goes through all the proper procedures of setting up the HVAC system (pulling vacuum, pressure testing, providing manuals, etc). They installed the appropriate items like having different shut off protections, having system and condenser on risers, air sealing, insulating the line set, etc. The technicians wore face masks, shoe coverings, uniforms, covered the basement carpet, swept the floor after they were done, etc. They replaced the insulation on my existing line set, replaced the disconnect box, avoided sharp angles on new ductwork, rebuilt my supply box (which had been poorly designed), rebuilt the gas exhaust pipes, and more. They pulled permits and gave me instructions on setting up an inspection with the county. They also registered for the warranties super fast. I received the warranty registration confirmations through the mail in just a few days, and got an e-mail for the Carrier warranty registration the same day they were done with the installation. It just shows that they are diligent and detailed oriented. I got multiple estimates, and one company said they couldn't install a 4 inch filter because the gas line was in the way. Well, guess what? Edgar and his team at Donmar was able to redesign the gas line so it wasn't in the way. Donmar had a fair estimate and I liked that they performed all the appropriate procedures to ensure a long lasting HVAC system, as well as being really easy to reach and very responsive when you call them. They provide a 2 year labor warranty on their work. Throughout the entire process they were honest and showed integrity. I saw a few negative reviews, but if you read them, they don't really make sense. There is one about the price of the thermostat. The Carrier Infinity thermostat is really expensive. It's easy to find the retail price online. Then there is some person who left the same negative feedback over and over. Then there are a couple that look like it was written by the same person using different accounts. So it's important to read the actual feedback instead of just looking at the rating. My experience was positive, and I highly recommend using Donmar for a new HVAC installation. There was a small issue with a defective part in the furnace and Donmar fixed it quickly. The technician, Kien, did a thorough job testing everything to find the issue and replace the appropriate part. It looks like Donmar has a lot of great processes in place. Some I already mentioned. I also like that they will text you when the technician (along with their photo) is about to arrive and you can track them in real time online. Don't hesitate to give them a call. read more

Donmar Heating, Cooling & Plumbing - Before and After HVAC System and Water Heater Installation - Heating & Air Conditioning/HVAC Near Me - Sterling, Virginia

I had both of my AC units replaced by Donmar (needed to have a crane hoist the units onto my rooftop deck). Superb service. On time, very professional, knowledgeable, courteous, and safe. My technician was Edgar....he is an outstanding technician. House is much cooler and efficient. Carrier equipment installed is great. Extremely pleased with the performance by Donmar.....will definitely use them again. Strongly recommended! read more

While recently having some electrical work done on my home, the electrician noted that whoever replaced my AC unit hadn't properly terminated the 2nd (now unneeded) power line into a junction box. It was terminated with black electrical tape & plastic caps. Worried, I contacted Donmar after safely turning off that breaker. Would Donmar stand by their work and fix a 10+ year old issue? Yep - Don saw the photos I emailed and had someone there within hours to address the issue free of charge. Thank You Don & Kien for taking ownership of this and making it look great. I can't help but continue to recommend Donmar based on their integrity in handling this circumstance and the current management there read more

I had a routine AC maintenance appointment which uncovered the need to replace my capacitor and cleaning of the compressor unit. I found Rapheal P. from Donmar to be easy to work with, the prices were reasonable, and he didn't try to pressure me into buying extra services. The capacitor had a 1 year warranty which was great because a few weeks later, a field mouse somehow found its way into the housing and shorted the darn thing, so it had to be replaced. I would definitely recommend Donmar/ Raphael! Rest in peace little field mouse. read more

We selected Donmar over multiple other vendors in 2012 to completely replace our old HVAC with a new Trane system. The pricing was good, and the actual install was very smooth and efficient. They did a great job. I was very pleased. Turn now to Sept 22 this year, during an annual inspection it was determined that our Humidifier was not working. The technician thought it needed a new control board but after having a humidifier specialist look at the unit it was determined that it had not been installed correctly. I wrote Donmar about this and Don responded to let me know that he had his installation foreman personally coming to the house to correct the problem free of charge. I appreciate their effort in resolving my complaint in a rapid manner. read more

I was hesitant to call Donmar since there were no reviews for this company, so I first called Air 1 who was highly recommended by Yelp. I was extremely disappointed with them (see my review for Air 1), so I called Donmar next. Not only they were most reasonable in terms of price, but also really fast and professional. My AC issue was resolved in no time! THANK YOU! Highly recommended! P.S. I had questions about my humidifier a month after I have done business with them, which was not serviced by them but they gladly answered my questions and were very friendly. read more

I had a very positive (first) experience with Donmar. My AC compressor stopped working and I called several companies attempting to get same day service. I ordinarily use an owner/operator who was out of town on vacation. Originally, non of the companies that I contacted could come out. However, Donmar called me back to tell me that they had a serviceman finishing up another job near by and he could stop by my house. My problem was very basic, that is the reason why I only gave 4 stars (instead of 5). I only had a blown fuse, but the service technician (Paul) was thorough and explained the different causes for a blown fuse. Based on this initial experience I would definitely call them again and ask for the same service tech. read more

Let me start off by saying that I have been using DONMAR for the better part of 30 years to install and maintain my HVAC units in my home. And I would say they've been pretty solid over the years and I've been happy with their service overall. Recently, I had DONMAR check on one of the two AC units in my house as it was not cooling like it should. My preference was to repair the unit as I have a well maintained, top of the line TRANE unit with a few years of life left in it. The technician provided three estimates: Repair: $2100 w/ 1 year warranty More extensive Repair: $3800 w/ 2 year warranty Replacement: $6700 w/ 10 year warranty So like most situations where I'm faced with a large expenditure, I decided to get a second opinion. I had another company come out and provide me with their estimate, which I chose to do the repair work. The other company fixed my unit for a total of $395. (parts and labor included) I'm not sure if the DONMAR tech had a bad day, anticipated other parts breaking soon, or if he has an incentive to up sell, all I can tell you is I'm very happy to have saved a little money in the process of getting a second opinion. read more

Used this company for 10 years and always received good service and felt they treated us fair. However, today they ripped me off by adding an extra $95 charge for a maintenance plan that I never asked for. I asked them to inspect my system and they sent a technician named 'Kien'. After he was done with the inspection, he described the work he suggested we have done which we agreed to. After the work was compete, I was not available and he had my wife pay and without any notice or permission, he slipped an extra unapproved charge for a bogus annual maintenance plan. And what's worse and even more unethical is he knew we are selling the house and wouldn't need such a plan. Beware !!!!! read more

Great service and fast service. Came on time and was able to access the problem.

This company installed a new HVAC system in our home and we also used them to install new condenser for a rental property we have in Ashburn. The technicians that were deployed were knowledgeable and the service they performed have always exceeded my expectations. read more

I am with Jay, bought a groupon and they gave absolutely pathetic service. The one star is actually for giving me a huge estimate to fix an issue which prompted me to spend time researching it at length and ended up fixing it myself. Just reeked of poor business ethics, take the 40$ as learning to never trust such firms read more

Very rude customer service. The operator is curt and abrasive. Donna? I believe her name was kept telling me that since my unit is a condo it is a high rise (even though I live there and it's not it is garden style) and that they will have to charge me 50 extra dollars. After the manager/owner corrected her she then starts raising her voice at me saying how am I supposed to know that I don't go out on the road to do the repairs/inspections. Read the review for this company in Alexandria. It is the same company and the review also states how incredibly rude the lady is. I do not recommend business with this company. read more

I purchased their service through a Groupon offer, nothing major just a check up for the A/C. Their ad states they cover Prince William County which is where i reside in. Called to make an appointment and the lady that picks up the phone and she sounds like she really hates her life. All i asked was to make an appointment and she said they dont cover Triangle, VA which is...... in PWC; I even told her im right on the border of Dumfries which she said they do cover. When I mentioned that she said hold on, came back and said "yeah we dont cover Triangle". Didnt ask for my address to verify or anything... honestly I dont think she really asked anyone, she was not very helpful at all. Probably a good company I can't vouch for their service but disappointed in the false advertisment. read more

Don't even bother with this company, utterly useless. You call the central number to schedule something and it sounds like you've just caused the biggest inconvenience of the week to the lady who answers the phone. She's all huffity when she answers the phone, then put me on hold only to come back 2 minutes later to ask how she can help me! I said I just spoke to you asking for a service, and I'd still like a service please! She starts huffing away again typing my details in to the system when it transpires that she already knows my name based on my address. Turns out this was the company I attempted to get a service call with for my AC unit in summer. Granted it was summer and granted it was a hot one, but I scheduled no less than 2 service calls with them only for THEM to call ME telling me they were rescheduling. The last reschedule put me out an entire MONTH. Evidently more lucrative deals were coming in for them, putting service calls to the back of the line. Total waste of time and money, this company. But do call the central number 703-435-0205, if you fancy hearing someone who will sound angry because you called her and woke her up from her nap. read more

They are great. They quickly went out with two days to fix an air conditioning system in my rental property. I was skeptical believing that many vendors might try to charge a lot but not Donmar. They charged a reasonable amount My tenant is happy and so am I. read more

Scheduled an appointment for maintenance for my HVAC unit. The technician they sent was very helpful and knowledgeable. I would use them again and recommend them to others. read more

We've been doing business with Donmar for several years. They installed a hybrid system in our home a few years ago, and we're very pleased with the system and their support. This month we called them in to do a checkup on the A/C unit at my daughter and her husband's townhouse. Paul spent s great deal of time answering our questions and and making suggestions to improve the quality of comfort upstairs. The unit did need a new motor. Pricing was good. Donna called the next day with the pricing and set up the appointment. Paul came out and installed the motor. Can't say enough good things about Donmar. We'll keep going back! read more

I called hoping for same day service. They were able to arrive service within the hour. The technician arrived on time and called me upon arrival. He worked on the system for more than an hour and told me what the problem was. He gave me a written report about the problematic HVAC system. I received timely and relevant information. I would recommend their services to anyone. read more

Edgar and Javier did a fabulous job installing our new whole-house humidifier! They were professional, right on time, and very kind and courteous! I am simply blown away by the attention to detail, the testing to make sure everything was working properly, and the time taken to explain the whole system to both my husband and me! I just cannot say thank you enough! I'm so very happy and grateful, and I look forward to working with your company again! read more

I have done business with Donmar since 1997. They always give me a fair deal, shoot straight and I can trust what they are telling me. Their techs wear the booties and are polite. I put it an extensive HVAC system a few years ago, there were some technology bugs, but Donmar was there every step of the way to make things right. Donna has been calling me for years to remind me of my warranty service. I recommend Donmar for all of your HVAC needs! read more

Their service is super pricy. They have groupon deals that you pay minimum amount for them to come and inspect your A/C and say it has several problems. But they will charge you crazy for doing the suggested repairs. I cannot believe for 15 mins worth of work with minimal tools required, they made me pay $320. I will never ever go back to them. read more

As others said, the customer service is terrible. Donna is rude when you call. They came to our house and we had a small problem that only required cleaning our unit. The technician went into the furnace room and shut the door. I knocked loudly and repeatedly to ask him a question but he did not answer so I assumed he was outside. 25 minutes later, he emerges and charges us $300 for a job with hardly any labor and no materials but cleaning spray! Why did he not open the door? My guess is he was hiding the fact that it was probably a 5 minute job. Very suspicious and a total scam and rip off! We will never call them again! read more

If I could give 0 or negative I would! Very unprofessional first of all and second, if you are a female, they'll take advantage and act as if you know nothing and treat you that way! I was very disgusted by the way I was treated and when I called their head office to tell them, I was told I would get reimbursed my money for the service call fee. The lady told me she would call me back a couple of days later to get my info and she did. A week later, I checked my bank and the money didn't go through. I just called and they sent me to Don to chat and his exact words "I was waiting to hear your side of the story." EXCUSE ME! You had someone gather my card info and say I was being reimbursed when that wasn't your intention at all. Will never use this company ever again and will make sure others watch their back who do use them. They'll lie and take advantage of you. read more

I bought a groupon voucher for an AC unit inspection from Donmar. The technician who did the inspection seemed professional and told me my unit was in excellent condition. That was a few weeks ago. However the unit have stopped blowing cool air since yesterday. I called Donmar today and was told a technician would contact me shortly. I have not heard from them since then. I am puzzled how a "perfect" machine would stop working properly only a few weeks after the inspection. read more

Donmar was great! Our upstairs system went out, of course during this major heat wave, and Donmar was out first thing the morning after we called! After they left we waited about 6 hours and it still hadn't cooled down at all, so I called them thinking that the job wasn't done correctly or there was a bigger issue, but they informed me that with the heat outside and the unit being in the attic it could take as long as a full day and over night to cool our home down. So just in case they scheduled us first thing the following morning, next morning comes they call an hour ahead of time to check our system, and sure enough if was FREEZING cold in here! They also took the time to inform me of a few things in regards to the heat outside and how to set our thermostat to maintain the most efficient cooling. Lastly, their pricing was extremely fair and was actually much less than we had anticipated to pay. Highly recommend! read more

Great company -- replaced my furnace very efficiently and effectively. Even received personal attention from the company president. Thank you! read more

What great service and expertise. Don took care of me when I needed a thermostat replaced on a Saturday morning. Mark came out and did an outstanding job the same day in installing the new thermostat when no other contractor was available. He identified other HVAC issues I was having and will definitely have them back to fix issues from a faulty initial contractor. I highly recommend Donmar! read more

Quick response to assess AC system after it died during a "Heat Dome".. Very professional. While I ended up using the Homeowners Insurance to replace the ENTIRE system (& thus their contracted HVAC company), I highly recommend DonMar. read more

I first became a customer earlier this year when our AC stopped working and no other company could come out on a weekend to fix it. A bad capacitor was replaced and we were cool again, however they advised that the health of our compressor was deteriorating and that we were on borrowed time. Several months later our compressor did finally go out and we decided to replace the whole system, inside and out. Donmar showed up early the day of the install and it was completed that same afternoon. Installation looks great and functions flawlessly. I couldn't be happier. read more

I recently moved to a new house which had a older AC unit that was in need of replacement. I have been working with a competitor to Donmar's for many years and was very happy with their service so I requested a quote. I asked Don to provide a replacement quote for the unit for comparison purposes. Don's price for the replacement was significantly better and also included a larger and more efficient air handler. His instillation crew did a wonderful job both installing the unit and working with us on the placement of the new second thermostat to control the new zoning system. I have nothing but good things to say about the whole process. read more

The customer service was top notch. They were able to get us scheduled on short notice the next day (which was a Saturday). They then called to check in during the day and also to let me know when the technician was finishing up the previous appointment. The technician called earlier in the day to give me instructions for preparing the system so that he can save time working on it (letting it run and thaw out if there is build up). The technician was very knowledgeable, professional, and polite (as was everyone that I interacted with there). Highly recommend. read more

I just wanted to take a quick moment to praise your're service technician; Jorge Miranda who serviced our heating system this morning. Mr. Miranda arrived on-time and even had the courtesy of calling 15 minutes ahead to ensure we were ready for him. I knew Mr. Miranda was going to be exceptional, when he entered our home and immediately shook my hand and proceeded to put shoe covers on to ensure he did not bring dirt onto our carpets. Mr. Miranda thoroughly discussed what he was going to service today and approximately how long this would take. He then proceeded to service the units and kindly requested us to review his notes. Overall, Jorge Miranda was attentive, respectful and patient throughout our entire service. DONMAR is lucky to have such a friendly and professional service technician in Mr. Miranda. My family will be sure to use DONMAR HEATING & COOLING in the very near future. read more

We have been using Donmar Heating & Cooling for more than 15 years. They contact us for our maintenance twice a year. The technicians are professional and clean. I purchased our current heat pump from them and they gave me several options and made recommendations based on our needs. They did not push us to make a purchase and were available to answer all our questions. My experience with Donmar Heating is always positive and I would recommend them to anyone looking to get a maintenance agreement on their heating / cooling units and anyone looking to purchase a new unit. read more

Donmar has been servicing our heating and AC systems for 16 years. We get the annual contract which includes system checks in the spring and fall. They are always responsive and fair. Our tech for most of that time has been Mark. He is neat and efficient and honest. What more can you ask for!? read more

The Donmar guy came to check the AC. Put the Freon check instrument and kept leaking the gas, so that he can say that gas is low and can charge $500 for Freon. The outside unit's fan motor was bad. The guy said he has to replace the motor and then fill in the gas and total cost will be $800. It sounded fishy to me, why the Freon needs to be refilled if we are not doing anything to the Compressor, Coil or the gas lines? Then we checked with the local store, got the new motor for $120 and replaced it. They guy was trying to fool us by making it a low Freon issue. read more