THIS IS THE ONLY COMPANY YOU SHOULD EVER USE FOR A/C PROBLEMS!! Take my word for it. I had MyPlumber come in for a routine six-month check because air flow wasn't as strong as it was the year before. After taking a couple of hours to check everything, the tech declared the whole coil system needed to be replaced at the tune of more than $2K. I called Frosty's who had done the checkup before and a tech came out. Frosty's declared the coils fine and something with the outside unit needed to be replaced. I called Darius with Air One Tech because I needed a third opinion. He and his colleague were extremely thorough, debunked both other company's techs, and found out...oh, the outside breaker HAD BEEN TURNED OFF. I think it was the MyPlumber tech but I can't prove it. Also found out both techs had been analyzing THE WRONG OUTSIDE AC SYSTEM. Unreal. Turned the breaker back on, added a little freon, adjusted vents based on duct location and boom!, instant coolness throughout the house. I will never, ever use another company. read more

We own a rental property in Fairfax in which the furnace's light had gone off. My husband was out of town so I called these guys to come out and see if they can light the furnace. The guy who answered the phone was extremely helpful and told me that it's very easy to do and should take no more than 5 minutes. He told me that if he comes out he will charge me $95 because that's their service fee (which I was willing to pay). He then said that it would be just easier if he walked me through it over the phone because he said it wasn't worth me paying $95. OMG! blown away with the honesty of this company! So refreshing to see that people can be so kind and caring about someone over the phone that do not even know. Nevertheless, he walked me through the process and I lit the furnace myself (such a proud moment). Oh not over yet. He called me the next day just to make sure that it was working and if I had any further questions. If I ever need any kind of service I know exactly who to call. Thank you for helping me out this week! read more

Amazing customer service and techs! We called them at 8am one morning and they were at our house an hour later. The tech immediately diagnosed and fixed our problem quickly. Can't say enough good things about this company. read more

Furnace started tripping Flame Rollout Switch. We just bought the house 6 months ago, so had home warranty. Called them, and they put me in touch with Air One Tech. Dariush came out and diagnosed the problem as a cracked heat exchanger. Home Warranty wanted second opinion and sent another company to look at it, same diagnosis. Home Warranty agreed to replace the 23 year old furnace, and chose the second company (who's address is someone's house..), and was going to install low end unit. I preferred to go with Air One Tech as they were more well known and had great reviews. Dariush also seemed more knowledgeable. Decided to replace the old AC unit at the same time, and wanted to go with a Trane system after researching. Called Dariush and he sent me 2 estimates for different units within 2 hours, and explained the systems to me. I chose one, and he came by the same day (Tuesday) to measure and plan for the job. Thursday he and 2 others from Air One Tech arrived and installed the new system. After removing the old system, he showed me inside where there were actually several cracks in the primary heat exchanger. The lines from AC to inside unit were badly kinked in 2 places, and needed replaced. He routed the new lines more efficiently than the old lines were. They were able to handle that unexpected additional work after showing and explaining to me, and getting my approval, at a fair price, and we had heat that day. Upgraded from 90% to 97% efficient and from SEER 10 to 16. System is running great, connections to air ducts are sealed, no leaks like the old system had where it connected. After installation was complete, they checked air flow at registers, explained the dual-stage system, and configured my Nest thermostat to work with the 2 stages of heat. He also made sure I knew I had to register the equipment online with Trane to get the full 10-12 year warranty. Communications via email, phone, and text were always prompt, professional, friendly and helpful. read more

Great company! We had a ductless unit installed in our basement. All my emails were returned. All my questions were answered! The crew members were awesome and considerate. They arrived on time and they were also friendly. They left everything clean and the moved fast. read more

Air One Tech - Ductless unit in basement - Heating & Air Conditioning/HVAC Near Me - Chantilly, Virginia

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Am trying to sell my house, and discovered with horror on the day of an open house we held that the AC wasn't working. The next morning (Monday), I looked around, saw the great reviews about Air One here on Yelp, and decided to call them. Good decision on my part. They were able to come by my house that day, found and fixed the problem quickly (thankfully, it was only the capacitor), checked the system, and headed out without trying to upsell me, etc. Quick, professional, and knowledgeable. Would definitely use them again! read more

Air One Tech did a great job installing an new HVAC system after our old one failed. First the service call when my old system died: Dariush was professional and made it easy to understand the problem and alternative solutions. At no point did I feel like I was being pushed to do something against my best interests, and felt high trust in Dariush's advice. He is also very opinionated (a good thing!) - Dariush refused to install brands he considered subpar (which my own subsequent independent research confirmed). On the day of install: The Air One Tech team arrived on time, got the work done with minimal disruption to my house, and finished the job when they said they would. As a much appreciated bonus, Air One Tech replaced a piece of duct work that had rusted badly attached to the old air handler at no extra charge. 2 weeks later, the new system is working great and handling the wild swings in spring temperature like a champ. Dariush and his team at Air One Tech are a class act, and I would recommend them to anyone who needed HVAC work done in the NOVA area. read more

We needed AC service as a yearly requirement for HOA We called Air One Tech based on their good reviews. They were able to schedule us on a short notice. They were very professional and honest. I highly recommend and we will be using them again! read more

This company was very responsive to my call and did a beautiful job on the installation of a AC system and Furnace. The price was great also. I highly recommend them.!! read more

My gas hot water heater started to leak last week and I knew I needed to replace it as it was 16 years old. I called Air One because I had such a great experience when my A/C broke down in August 2016. They shuffled their schedule a bit to accommodate my urgent need and were here the next business day to replace my hot water heater. Air One Tech earned my trust the first time I used them and they also did a fantastic job with my hot water heater replacement. Air One Tech is truly a well-run company that deserves your business. read more

Could not be happier with the service. Everything from scheduling the service with Allison to the service from Dariush Jamasb were amazing. Dariush was very professional and took time to explain everything clearly. Air One Tech starting with this service is my to go business for HVAC. read more

Darius was fantastic. He was timely, professional, provided genuine and honest recommendations for an emergency AC issue over the summer. I was so grateful that he was able to come for diagnosis within 24 hours after initial request, identified the problem, and promptly replaced the AC so I dont have to suffer DMV summer heat. His price was fair, and most importantly, provided excellent service. Also, he sends receipts and invoices electronically. yay to keeping the environment green! read more

They are respectful, professional, and very competent at fixing your issue. Totally will use them again and highly recommend. Buuut you have to be on them about copies of your receipt. Well this is the first time I used them and was very happy. It might have been a fluke for me. read more

Dariush, the owner of Air One Tech, is a professional, knowledgeable, honest and courteous person. He gave us practical suggestions in terms of choosing the right systems for our two zoon house. He and his friendly crews worked hard for two days to replace our old air conditioning and fernanes systems. Jobs well done. Due to the resent big swing of temperature, we had chance to test our new cooling and heating systems and couldn't be more happier with the results. We strongly recommend Air One Tech. read more

Diriush was very responsive from the initial quote process. Excellent communication and service. Very happy with the new furnace and installation. It originally was going to take 2 days to complete (removal of old monster oil furnace), but since it was so cold, Dariush had extra crew in to have it done in one day. It's hard to find service like this anymore. read more

I called on a Wednesday to schedule an appointment for my elderly grandmother's AC unit to be fixed (in the midst of a heatwave). I was told that a technician could come out on that Friday to evaluate the unit and write a proposal- they gave me a timeframe of 9am and 12pm. At 11:45 the tech called to let me know he was on his way and would be there in 45 mins (not between the timeframe given, but oh well traffic happens). I called at 1pm to inquire - no answer from the tech so I left a message and to this day have not received a call back. I called the main number at 5pm, no answer so I left a message asking when they could reschedule/if they wanted to bother calling me to let me know about rescheduling. To this day haven't heard back from them. Update: I received calls and emails from the company after my review posted. read more

They were too much of a hurry to get out of there before the weather hit, so they were trying to rush things. I wanted to get preventive maintenance done on my air conditioning unit and they could not hook up the connections to measure the pressure of the coolant. Which surprised me because every time I've gotten preventive maintenance from other places they could hook it up with no problem. But eventually he went back and sorted it and connected it when I ask him to do so! I was surprised to see that this was rated number one on Yelp, which disappointed me, I won't use them again. read more

Best HVAC guys in town. Honest and professional service. I have used them at multiple properties. They don't try to up sell you and always very fair pricing. read more

Had a great experience with our HVAC, air compressor and water heater replacement. Amir and Angelo were very professional and kept me informed of the process, timeline of installs and maintenance needed. The owner, Dariush came for the estimate and gave a very competitive price and helped us after the install navigate a thermostat issue we had. The office was very responsive and scheduling very easy. Received texts with photos of who is expected to arrive. Highly recommend. read more

Renewed my yearly Maintenance Agreement with Air One Tech yesterday. Victor came to check out our AC. He was thorough, polite, efficient. Put on booties without being asked. Was good with our dog. What more could we ask? High recommend. read more

Outstanding process from beginning to end!! My 17 year old heat pump blew the blower motor. The Air One Tech was available that day for an appointment and showed up exactly on time. Found the problem and gave me a quote. I got two other quotes a bit higher, but ultimately decided not to spend the money on repairing an old system, but instead, went the route of getting the entire system replaced. Dariush came out (again, exactly on time), explained everything I needed to know about heat pumps and provide me a number of different estimates on everything from contractor level systems to the super elite systems (and inbetween as well). He beat all other quotes of similar systems and he offered Trane (which I swear by). The replacement was scheduled a couple of days later and the entire crew showed up 5 minutes ahead of schedule. They had the entire new system installed, checked, and tested and the old system removed before lunch time. All the tech wore shoe coverings, covered up the floor from the front door to the attic where the unit was and cleand up after themselves. This company has great knowledge of HVAC systems, very competitive pricing, efficient front office assistance, and some of the best tech service I have experienced. I will definitely use them again if I ever need to and would recommend you give Dariush a call if you're having issues with your system. read more

We were very impressed with Pheak. He inspected and found the issue with our AC system and provided further advice on maintaining the system and the pros and cons of upgrading to new thermostats. We really appreciated his professionalism, and he was cordial and in time. We would definitely use the service again. read more

I have used these folks twice. One to do a routine AC inspection and another to replace the AC of my fiancee. Both times I used them, they were on time, and had really good quotes. They even threw in a free thermostat when they switched out the unit. I will be using them for my future AC needs. read more

Just in case you don't feel like reading my entire review, let me sum this up in one sentence: If you are looking for an HVAC company, look no further--call Air One Tech!! For those who want to read on: Our 26-year-old air conditioner finally gave up its ghost. The heater still worked, but it was making all kinds of scary noises, and I'm not so sure it would have survived another winter. It was time for a new HVAC system...but whom to call?Calling any service company always gives me trepidation--you never know what you'll get, and we've had some really bad experiences in the past. So thank goodness for Yelp! I found Air One Tech with its amazing reviews, many of them mentioning its owner, Dariush, and the glowing reviews somewhat put me at ease. I called Air One Tech early on a Tuesday morning to see about getting an estimate for a new HVAC system. The lady who answered the phone said she would have her supervisor call me back, and within half an hour I received a call from Dariush. He was super nice and friendly and offered to come out that same evening! Unfortunately my husband and I had another commitment that night, but Dariush seemed very flexible and was able to come the following day. Before stepping into our house, Dariush was going to put on shoe protectors. We told him that wasn't necessary, but I did think it was a nice touch. He then started with a thorough inspection of our old HVAC unit and the size and orientation of our house. He was very friendly and personable, and he explained a lot about HVAC systems and answered all of our questions patiently and thoroughly. I really felt that he wanted us to understand what we were buying and to be able to make an educated decision. He then worked up estimates for three different systems for us (all of them Trane; that is the only brand he sells) and went over each one with us in detail. At no point did my husband or I feel pressured or pushed toward the pricier of the three options, although it is what we ended up choosing. We felt good about our choice because there had been no pressure, only education. What can I say, we liked Dariush and the whole experience so much that we decided to forego getting any other estimates, and we signed a contract with him that evening. He requires half of the payment at the signing of the contract, with the second half due upon completion of the job. One week later, Dariush returned with two men and our new HVAC system. I'm sorry I didn't catch the names of the two men, but they were both very friendly and polite. Dariush asked my husband and me if we had any questions, and once he was satisfied that everything was answered, he left, and the other two men installed our new system. Dariush returned later in the day to explain the new system to me (my husband had gone to work, but Dariush said he could call him any time if he had additional questions), and he taught me how to use our new touch-screen thermostat without making me feel stupid, which I am when it comes to technology! ;-) Then Dariush and his two workers cleaned up after themselves immaculately and left. The following morning Dariush called to follow up and see if everything was working properly and to make sure we were happy with our new system (which we are!). He again reiterated to call, text, or email him at anytime if we have any questions or concerns, and the amazing thing is, I think he actually means it! My husband and I could not be happier about our choice to go with Air One Tech! We have already recommended them to friends who might be looking at a new HVAC system this or next year, and we'll keep recommending them to anyone who will listen! read more

Dariush came out and found problem to why our AC unit was not working very quickly. My husband is a DIY guy and wanted to repair himself. But will call Air One Tech again in future. Great service! Thanks for your honesty and help on this! Really appreciated! read more

I am so impressed with this company! Professional and courteous! I had an AC problem which a technician came out to repair. Victor did a great job but the problem was still there. It was very complicated. The owner,Dariush, came at 830 the next morning to address this issue. He analyzed and diagnosed the problem which had to do with the drainage and piping. It was very involved. I doubt many would have been able to accurately assess and diagnose this issue so quickly. Problem is resolved. He showed me pictures and explained in detail what was wrong. I am one happy customer. I am signing up for their annual maintenance agreement to avoid problems such as I just had. A great and knowledgeable company to do business with. read more

Awesome!! I asked 5 AC companies to give me an estimate for replacing my furnace and ac in an older townhome. While 5 came to my home, only 3 actually delivered an estimate. Air One Tech was in the middle in terms of price. They were the most responsive in answering my questions and they did not try to upsell me. Once they started the install they discovered a couple of additional things that needed to be done which they did without any additional charges. My tenants were super-happy with the team that did the installation and all is well with the new unit. I'm totally sold on Air One Tech!! read more

My furnace began failing and the owner of Air One Tech, Darius, got involved. Not only did he worked to delay the replacement of the old furnace. But was extremely helpful in selecting a furnace that met my needs. His team did quality work and provided outstanding customer service. It is so refreshing to see this type of attention to detail in a good economy. So often times when the economy gets good customer service and quality of work goes down. read more

Great and knowledgeable. Got me up and running in no time. No pressure and not pushy on any unnecessary buys. I was sold in 5 min and will use them again for my regular maintanence. Thank you, sir. read more

Great customer service. Really glad I called Air One Tech. Dariush is great.

Great experience all around! Timely, professional, and explained everything clearly to me. Consider me a repeat customer.

I think this is only my second review i have ever written...i dont write reviews. I selected Air One Tech based on positive yelp reviews after our ac stopped working at dinner and the low temperature overnight was dropping to a chilling 78. Very happy I called them. Dariush answered the phone late evening and was able to come by the next day. Simple repair but explained everything throughout. Very polite and curtuous. Highly recommend. Customer Service plays a big part with me and they have it! read more

My heater wouldn't stay on. I found Air One on Yelp and called at 7:40am and spoke with the owner Dariush. He said he would be at the house before 9am. He was here by 8:20am. Extremely professional and friendly. His technician was also very professional and friendly. They identified the problem quickly, cleaned the sensor and tested the heater. It came on immediately. He only charged for the labor and made additional recommendations for maintenance and service. I felt they were trustworthy and reasonable. By the way, they are pet friendly and my dog was a happy girl getting so much attention. Thank you AirOne for your excellent service and professionalism. In today's world it's hard to find trustworthy companies such as yours! Will definitely be using them for annual maintenance and recommending them to friends and family. read more

Great work, very responsive and professional. The owner is extremely nice and will give you options if worried about cost. Does not immediately push replacement of entire system. read more

This place is as good as it gets. Trust the reviews and delete your Angie's List subscription. We are having tons of work done and a bit cautious due to a few bad experiences. We called on Air One Tech twice and both were good experiences. They are reliable, responsive, knowledgeable, and reasonably priced. Refreshing experience. read more

Dariush was timely, professional, provided genuine and honest recommendations for my AC/HP issues. I had him out about a year ago under my home warrantee and was impressed by his honestly then. He told me at the time he could fix the issue (at full cost) or he told me the simple fix that needed to be done so I could do it myself (at only minimum cost of the warrantee service). More recently I called him back to perform regular service on my AC/HP unit. During the service, he discovered a Freon leak and gave me options of what to do. It was either to repair for about $400 (which would probably require additional repair 6 months - a year down the road) or replace the unit. We decided the replace the unit. Dariush performed various engineering measurements and calculation (as an engineer myself, I was impressed) and gave us multiple options for new units, laying out all the specs and ranges. We went with a midrange unit for about $7600. One issue came up where we needed a crane to get the outside unit in place (I live in a townhome with a high wall behind me). Dariush spent several days working to find us a good deal on a crane and in the end we were very please. The install went well and the unit is great. My house is now very comfortable and quite. I highly recommend using Dariush at Air One Tech. It's hard to find honest hard working people now-a-days. read more

On 8/15/14 replaced my entire 21 year old Carrier HVAC system with a high efficiency Trane one. Amazing how far technology has come. Air One Tech only uses Trane, which my research showed to be excellent quality. Dariush recommended a Trane system that matched my house's size and age, Their quote was very reasonable, quick, and they did an excellent installation job. One great thing about their installation is how cleanly they work. Before they begin installation, they lay out fabrics and papers all over the walking surfaces and constantly clean their work area. Afterwards, we had to do very little cleanup. They also are extremely knowledgable about HVAC system. Dariush also reprogrammed my thermostat. Overall very happy with the job and the whole experience. read more

My wife and I have been fortunate to work with Dariush and Air One Tech over the last two years. He and his team have serviced our air conditioning and heating systems each season without fail. Recently, one of our two air conditioning units would no longer hold a charge. We communicated this to our landlord who elected to replace the AC unit, the furnace, and the coil. Two days prior, Dariush came out with his iPad to take pictures, measurements, have us sign the contract electronically, and collect the deposit. All of this was done quickly and copies sent instantaneously to my e-mail. I appreciated the reduction in paperwork and the speed at which I had copies of the finalized paperwork. On the day of the job, Dariush and his team arrived on time & prepared to go to work. They wore booties throughout the home and laid protective covers on all four floors as they traversed between the upstairs furnace area and the outside air conditioning unit. The job took the majority of the day, but I'm writing this review from a home that's now cooler, more energy efficient, and quieter with the new Trane units. He guaranteed his work for two years...plus with online registration Trane also has a warranty for their customers. We're fortunate to have a landlord who takes care of her tenants, and equally lucky to have had Dariush leading his team on this job. I should note there's another old unit at our home that will likely need to be replaced in the future. At no point has Dariush ever pushed us to purchase anything that wasn't absolutely essential, and he explained what he was doing every step of the way. And if that wasn't enough, Dariush called us personally the next day to ensure everything was still working smoothly. The entire team's professionalism and expertise was exceptional. I would hire Air One Tech in a heartbeat and I intend to hire them again to perform regular service and maintenance each season. Thank you Dariush and thank you Air One Tech! read more

serviced my AC unit - were prompt and had no issues since the did some repairs to my unit.

I tried to get quotes for a simple maintenance contract for commercial HVAC units. Most businesses did not get back to me in a timely manner. Air One Tech came and gave a reasonable quote and started the service the next day. Pain free experience. Added bonus is that they are paper free! read more