Mannix Heating and Cooling is a full service HVAC contractor with a location in Chantilly VA and Gaithersburg MD to serve you. We offer an extensive array of services designed to keep your heating and cooling equipment operating at peak efficiency through many years of reliable operation. We also provide water heater replacement, standby home generators and electrical panel replacements. For more information, please email info@mannixhvac.com
Business highlights
15 years of trusted experience
Emergency Services Offered
Services we offer
Heating & air conditioning - repair, replacement & installation, water heaters, humidifiers. Electrical - upgrades, generators. Service agreements
Services we don't offer
Window Units, New Construction HVAC Systems, Oil Furnace Repair
it was excellent service. They made small dent in the wall during installation and not only did they repair the spot in the wall they painted the entire wall
Description of Work: replaced air and heating unit
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
Joseph B.
02/2016
5.0
heating & air conditioning/hvac
+ -1 more
Mannix provided a reasonable estimate to replace my old heat pump heating and cooling system with a new Carrier Infinity Smart System. They were very courteous and helpful during the whole process of getting Washington Gas to install a gas line from the street to our home, installed all of the connecting gas lines, exhaust and air intake ducts, putting in the new equipment and taking care of a few minor issues. They explained all that needed to be done and why. This was a big project that took two days to complete once the gas line and meter were installed. One day was spent adding the gas lines and duct work. The next day was spent installing the new furnace, air handler, humidifier and new smart thermostat and hooking up the gas lines. After the work was finished I noticed that they had reused my old air filter instead of installing a new April Air 2410 unit. I also noticed a clunking noise that seemed related to the humidifier pressure shut off. I contacted Mannix and they sent two technicians out to install a new air filter and resolve the clunking noise. They returned and took care of every issue beautifully. These technicians worked quickly and efficiently in handling all aspects of the job. They were polite and professional and gave a wriiten record of all the work completed. I especially like how neat the system looks compared to the old electric air handler and heat pump. The new Carrier Infinity Gas Heating System has worked beautifully, even through a blizzard. My wife and I noticed how quiet our house is compared to the old system. The humidifier was able to keep the humidity inside at a comfortable 31% even during the coldest weather. We could not be happier and would gladly recommend Mannix Heating and Cooling LLC to anyone needing heating or AC service or even a electric - gas conversion system. The technicians, Matt and Billy, did an excellent job installing our new gas system.
Description of Work: Mannix converted my electric heat pump to a natural gas furnace, hot water tank and ran a line for a gas log fireplace.
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$15,200
Stuart K.
01/2016
5.0
heating & air conditioning/hvac
+ -1 more
They say you figure out who your friends are when things are tough, and that certainly holds true of your vendors too. During the snow storm over the last few days, we were completely snow-bound and no one could reach the house. Our primary furnace stopped producing heat. Unlike most of the HVAC companies, these folks called back immediately from their call center, got a repair person on the phone multiple times, and walked me through trying to diagnose the problem across these multiple calls. This was when I was NOT under an annual contract with them, and without charging me a dollar. To say the least I'm signing up both our units for annual contracts with them. In an era of commoditized services, these folks demonstrated how to differentiate themselves. Thank you Bill, Sarah, and others.
Description of Work: Phone support when we were snowed in.
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
Eric M.
01/2016
5.0
electrician, heating & air conditioning/hvac
+ 0 more
Mannix was great. We worked with 2 of their HVAC specialists and two electricians. We also met with the owner, Jerry. Very impressed with their staff and the company as a whole. Will use for any future HVAC or electrical needs. Highly recommend this company.
Description of Work: Mannix replaced faulty circuit breakers, added outdoor outlets on a new circuit, and added a larger heating element to our existing heat pump that was installed by previous home owner (by a different company). They diagnosed and fixed wiring issues created by previous HVAC contractor and solved all problems.
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$1,500
Jack S.
01/2016
5.0
heating & air conditioning/hvac
+ -1 more
. I was very impressed by the responsiveness and professionalism of Mannix and AJ.
Description of Work: Gas furnace would not come on - outside temp 19 degrees and dropped to 50 degrees in house. Mannix was very responsive. Technician named AJ arrived within 90 minutes of call. Did a great job of rapidly troubleshooting the problem and identified a clogged drain line that had cut off the furnace. He cleared the drain line - it was amazing to see the amount of soot and gunk that had completely clogged the line. He then verified the correct operation of the furnace.
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$225
Daniel W.
12/2015
5.0
electrician, heating & air conditioning/hvac
+ 0 more
Technician came out the next day and was extremely helpful and patient. He wasted neither my time nor my money and while my problems ended up being electrical, rather than heating system related, he was happy to poke around and help me understand what I needed to tell the electrician.
Description of Work: Called Mannix to check on two heating systems (my house has three... yeah...) that were causing trouble.
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$89.95
Peter F.
12/2015
5.0
heating & air conditioning/hvac
+ -1 more
They provided quick diagnosis of the problem and had the needed part in their truck. Repairs were done within a couple of hours.
Description of Work: New starter condenser of the AC fan
Rating Category
Rating out of 5
quality
5.0
value
3.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$500
Yana R.
11/2015
5.0
heating & air conditioning/hvac
+ -1 more
We've been using Mannix for over 3 years now. They replaced one of our HVAC systems. They're also performing spring/fall HVAC maintenance for us. Price is reasonable and company's technicians are professional, honest and show up on time.
Description of Work: HVAC fall check
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$175
Kenneth D.
11/2015
5.0
heating & air conditioning/hvac
+ -1 more
I have used Mannix for servicing my old, 60yr old hot water boiler used for my radiator heat in our home. The old system was not efficient, but kept the house warm throughout the years. When I fired it up for the first time this season, the circulation pump would not come on, leaving the system nonfunctional.. We received three estimates to replace the pump ($750 was the least), and three estimates to replace the whole system. Mannix gave us the best price for either, so we went with a new Carrier boiler, being the most cost effective. Mannix came out on time for each estimate, and was extremely professional overall. Their team of four technicians installed the new system in half a day, and they were especially professional - clean, quick and efficient. The new boiler is efficient and quiet, and is night and day better that the old system. I can't overstate how professional Mannix is - they are the best! Highly, highly recommended!
Description of Work: Replace Gas Boiler, new backflow preventor, new air scoop, new expansion tank, fill assembly and low water cut off.
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$5,400
Pam R.
11/2015
5.0
heating & air conditioning/hvac, water heater repair
+ 0 more
Exceptional company to work with! High quality work at competitive pricing. The crew was extremely professional and clearly understood how to install and explain the operations of the equipment. They arrived early, took time to prep the job site and protect the flooring and surrounding areas and applied the same amount of care was to clean up. We had two teams of installers - Billy & Matt and Jeremy and Melvin. They were all fantastic!! We are switching to Mannix to continue with our energy maintenance plan.
Description of Work: Installed two HVAC systems (basement furnace, coil, AC, thermostat)(upstairs attic air handler, heat pump, thermostat), water heater, and humidifier.
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$24,000
Kirby H.
11/2015
5.0
electrician, heating & air conditioning/hvac
+ 0 more
After 13 yrs in the townhouse, the builder grade HVAC in the bedroom level broke. After reviewing various contractors on Angie's list, I called Mannix for an estimate and quickly got a visit from Hal. I wanted to go with Carrier since my friends and family have experienced great reliability with that brand. He showed me my options and taught me something new about not being able to get a super efficient furnace installed because of the location of the furnace in the townhouse. Had it been a single family house that would have been possible. An estimate was given and the price was reasonable especially with the 0% financing plan. Two crews showed up at around 8am and was able to complete the job before the heavy rains in the afternoon. It was a good thing since they had to sit equipment outside as well as install the outside units. Before work began inside, canvas was laid down over the hardwood floors and carpet. The job was completed in about 6 hours. The technician showed me how to operate the wifi thermostat before they left. There was one thing that irked me a little. The light bulb in the attic was accidentally broken. Rather than ask me for another one, the technician took one from an existing lamp fixture. Overall, it was a job well done. I've noticed the increased efficiency in both units compared to the original equipment.
Description of Work: Replaced gas furnace with AC with corresponding outdoor units for levels 1 and 2 of the townhouse and heat pump for level 3
Rating Category
Rating out of 5
quality
5.0
value
4.0
professionalism
4.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$16,000
Vasily A.
09/2015
5.0
heating & air conditioning/hvac, water heater repair
+ 0 more
Straightforward proposal, competitive pricing. On installation day two teams arrived exactly on time, very polite and courteous; considering the scope and complexity work was completed quickly and in professional manner
Description of Work: Installed two air conditioning systems and water heater
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$12,000
Lisa D.
09/2015
5.0
heating & air conditioning/hvac
+ -1 more
The technician did a thorough review of the situation, checking all units (heat pump in attic, main HVAC system in basement, and units outside). It took over an hour, he clearly did not rush. He took the time to thoroughly explain everything and what our options are.
Description of Work: We called Mannix because we use them for our Spring and Fall maintenance checks. We called them to have them check on a problem we were having with some water leakage in our basement around the HVAC unit. They performed a service call.
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$95
THOMAS & Ingrid R.
07/2015
5.0
heating & air conditioning/hvac
+ -1 more
They are very professional and did good work.
Description of Work: They came out and topped off our A/c unit.
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
David L.
07/2015
5.0
heating & air conditioning/hvac
+ -1 more
The team was excellent. From the front office to the engineers who came to our house. Professional and reliable, I can't ask for more than that.
Description of Work: Repaired A/C
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$500
WALTER W.
07/2015
5.0
heating & air conditioning/hvac
+ -1 more
I first had Mannix provide a second opinion on the state of my old unit as the compressor seemed to be near its end of life. Once satisfied that I needed a new system, I had them provide an estimate. I went with Mannix because they offered the high efficiency equipment that I wanted; they offered the best warranty on parts, compressor, and labor; and my research regarding reliability of Carrier suggests it is among the best products (Consumer Reports); and Mannix is factory certified with Carrier so obviously know the equipment. My last system was Carrier and it performed very well through it's normal service life. In the estimate, they offered a furnace/CAC combination that was properly sized to my home (I had a quote from another firm that was clearly not) and focused on my efficiency priorities. All of the people I interacted with from Mannix were extremely professional. They let the equipment sell itself, were right on time for three separate appointments (inspection, estimate, and installation), and installation went very smoothly. I am very satisfied with the work performed and am very happy to have cool air flowing again.
Description of Work: Replaced my gas furnace, central air conditioner, home humidifier, and thermostat. Also extended the flue to meet code requirements.
Rating Category
Rating out of 5
quality
5.0
value
4.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$12,000
Fred M.
06/2015
4.0
heating & air conditioning/hvac
+ -1 more
We got them twice and it is a fixed price for year. What is bad about them is that I really, really liked the first guy who came out. He fixed my air conditioner. I liked him so much I signed up for their service. Since then their turnover has been so high that I have never gotten the same guy back a second time. So, some of them are good and some are bad. The quality of the work has been fine so far. Their professionalism depends on which one I get; most of them have been pretty good.
Description of Work: They were here for spring maintenance a month or two ago.
Rating Category
Rating out of 5
quality
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$150
Duane E.
06/2015
5.0
heating & air conditioning/hvac
+ -1 more
We were satisfied with them. We used them before. They were good. I do not think we had any issues. I think it worked out fine. I think they did everything as planned and scheduled.
Description of Work: We did use Mannix Heating & Cooling to install our new heater for the house.
Rating Category
Rating out of 5
Yes, I recommend this pro
$2,500
KWANGWOOK A.
06/2015
5.0
appliance repair, heating & air conditioning/hvac
+ 0 more
I asked Mannix to inspect my A/C system to get an 2nd opinion for oil leaking problem from my blower motor. The technician came to my house on time. He inspected the A/C system and blower motor and gave me a similar diagnosis - the motor leaks oil, not an immediate threat but better to be replaced. He seemed to be not so enthusiastic at first sight, but inspected the blower motor thoroughly and answered every question I asked professionally. He even contacted the Mannix company to check the blower motor was still in warranty. (Sadly, it was not). Also, the estimate from Mannix was also much cheaper than the previous one so I decided to use Mannix to fix my blower motor. For replacing the blower motor, they contacted me one day before to confirm my appointment and the technician arrived on time. He replaced the motor and checked its working status within the time he promised to finish. the new motor is working well now.
Description of Work: Inspect the A/C system (blower motor) and replace blower motor
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$680
Patricia E.
06/2015
1.0
heating & air conditioning/hvac
+ -1 more
The unit never worked properly. I had Mannix come in to determine what the problem was and they did not fix it. I called another HVAC repair company (Snell) and they told me that the cooling/heating unit I have had a defective part. Snell said to replace the part would be free since it is under warranty, but that the labor would be $1500. When I was investigating which air conditioning company to install my unit, I contacted both Snell and Mannix. Mannix was slightly cheaper, but Snell offered a two-year labor warranty, which I did not know about until recently. My advice to you is to work with Snell or another company that can offer you an extended labor service.
Description of Work: Mannix installed a new air conditioning/heating unit for me a year and a half ago.
Rating Category
Rating out of 5
quality
1.0
value
1.0
professionalism
1.0
responsiveness
1.0
punctuality
1.0
Response from Mannix Heating & Cooling
Here are the facts as I know them with regards to this member; On July 31, 2013, we installed a Magic Pak Package HVAC unit in this member’s condo. Since this condo had an existing Magic Pak through the wall unit, we were limited to replace it with the same manufacturer, as the wall opening through the building could not be changed. We had not heard of any problems or issues until we were called for a no heat service call on January 5, 2015. What our tech found when he arrived was the condensate drain pipe was knocked out of the drain causing the emergency drain switch to trip which shut the unit off. This HVAC unit is located in a closet. The closet is used for storage, and we believe the pipe was knocked when something was taken from the closet. When we showed this member what happened, and informed her there would be a charge for the call since this was not covered by the warranty, she became very upset and refused to pay the service call fee--to quote this member “I’m not paying $100 just for you to put a pipe back in a drain”. Our Service Manager was contacted while the tech was at her home; he decided to waive the service call fee as to not get into an argument with the customer over the issue. We hadn’t heard from this member again until we received a call on May 29, 2015. She called demanding to speak to the owner and stated we sold her an inferior piece of equipment. She stated that she had Snell Heating & Cooling at her home, and the tech diagnosed a bad evaporator coil. When I spoke with this member, I told her that I understood her frustration since the unit was just less than two years old. However, her anger was misdirected as this was a manufacturer defect; and we did not manufacturer the unit. I also reminded her that we were limited to installing that brand as it was the only unit that would fit her condo. I asked her why she didn’t contact the manufacturer with her complaint, and she stated “because I think I wouldn’t get very far complaining to them”. Given our past history with this member and that the one year labor warranty with us has expired, I told her it would be best if she had another contractor repair the unit. It was at that point that she threatened “I will write a bad review about your company on every website I can find” and hung up. We are sorry this member had a bad experience with the equipment we installed. Had she been fair with us after the installation, we would have done all we could to help her in this unfortunate situation. But given the situation, I felt it would be better for her to use a different contractor. Jerry Mannix
Van & Mary T.
05/2015
5.0
heating & air conditioning/hvac
+ -1 more
They were able to work very quickly and they are very good.
Description of Work: They replaced the air system
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
Van & Mary T.
05/2015
5.0
heating & air conditioning/hvac
+ -1 more
They did a good job and they did exactly what I wanted. They are very professional.
Description of Work: They replaced new air conditioners. I did have minor repair of the last window.
Rating Category
Rating out of 5
quality
5.0
value
4.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$250
Loomis I.
05/2015
4.0
heating & air conditioning/hvac
+ -1 more
They refused to fix it.When he showed it to me, it looked unsafe. He was nice and polite, but he should have just fixed it instead of arguing, because it only took him 2 minutes to fix.
Description of Work: They came out twice. The first time was a year ago and they did horrible. The second time was about a month ago. They came out to fix something they screwed up the first time. The first time they were changing a motor. There are some wires that come out, and it was attached with duct tape. They said it wasn't them, but no one else has touched it.
Rating Category
Rating out of 5
quality
1.0
value
1.0
professionalism
3.0
responsiveness
4.0
punctuality
5.0
$69
Andrew G.
05/2015
5.0
heating & air conditioning/hvac
+ -1 more
It's a local company and I feel like I'm helping out most of the people. The kid Nevan, he's a charmer, really nice guy, very thorough and conscientious.
Description of Work: Mannix Heating & Cooling. A winter check. Tune up, they make sure the heating, ac work.
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$100
Lavanya R.
05/2015
5.0
heating & air conditioning/hvac
+ -1 more
Professional and courteous provider. On time and negotiated price with us for about 10%.
All statements concerning insurance, licenses, and bonds are informational only, and are self-reported. Since insurance, licenses and bonds can expire and can be cancelled, homeowners should always check such information for themselves. To find more licensing information for your state, visit our State Contractor License Requirements page.
*Contact business to see additional licenses.
Service Categories
Heating and Air Conditioning
FAQ
Mannix Heating & Cooling is currently rated 4.9 overall out of 5.
Sunday: Closed
Monday: 8:00 AM - 6:00 PM
Tuesday: 8:00 AM - 6:00 PM
Wednesday: 8:00 AM - 6:00 PM
Thursday: 8:00 AM - 6:00 PM
Friday: 8:00 AM - 6:00 PM
Saturday: 9:00 AM - 1:00 PM
Mannix Heating & Cooling accepts the following forms of payment: Check,CreditCard,Financing Available