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Mannix Heating & Cooling

Heating and Air Conditioning

About us

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

Amenities

Free Estimates
Yes
Warranties
Yes
Senior Discount

5%

Emergency Services
Yes


Accepted payment methods

Check
CreditCard
Financing Available

Photos of past projects

Reviews

4.9736 Reviews
Number of StarsImage of DistributionNumber of Ratings
5
92%
4
4%
3
1%
2
1%
1
1%


Rating CategoryRating out of 5
quality
4.9
value
4.7
professionalism
4.9
responsiveness
4.9
punctuality
4.9
Showing 201-225 of 736 reviews

IVAN S.
04/2014
5.0
heating & air conditioning/hvac
  + -1 more
Steve came by punctually to give me an estimate. He was very professional and called and gave me my options for replacing the upstairs furnace (I have two zones in my house). Mannix's installers were very professional and did a nice job installing the new system. There was a bit of confusion over the thermostat that was supposed to be installed as part of the Installation Agreement, and they had to make a second trip out to install the new thermostat. When they returned to install it, we discussed it and opted not to replace the current thermostat because it was working fine. We have been through one full winter with the new furnace and it has worked very well. (The upstairs of my house is considerably warmer.) Overall, I found Mannix very pleasant to deal with.
Description of Work: Installed a new furnace in my attic for the upstairs zone of my house.

Rating CategoryRating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro
$3,515

George W.
04/2014
5.0
water heater repair
  + -1 more
It went very well. I would recommend them.
Description of Work: They replaced a 40 gallon gas water heater.

Rating CategoryRating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro
$1,000

Shelley G.
04/2014
5.0
heating & air conditioning/hvac
  + -1 more
They were very knowledgeable when they came out to see my setup and recommend the proper size for my home and to address other issues I had regarding heating and cooling my home to ensure I was getting what I needed. When they arrived the following week to install the system they were able to complete everything in a marathon day! It was amazing!!!! Things went smoothly and my new Carrier Infinity system, along with the changes they made, has improved the comfort of my home. Plus I was able to use their 5 year 0% interest financing plan! A Win-Win all around! I would definitely recommend them to anyone looking for a new system or make improvements in the comfort of their home.
Description of Work: Installed a new HVAC system (inside and out), HWH, humdifier, germicidal light and air cleaner. They also relocated the new WIFI thermostat, redirected some duct lines and copper piping, plus added new shutoff valves.

Rating CategoryRating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro
$10,750

Lori K.
04/2014
5.0
heating & air conditioning/hvac
  + -1 more
Everyone showed up looking clean and professional. They were on time. Communication was easy and timely. They allowed us to discuss options and were even willing to talk with my father since I don't know as much about this sort of thing. They never made me feel like I was putting them out even though it was probably extra working explaining things to me and then to my father who lives out of state. I really don't have any complaints. It cost a ton of money I wasn't prepared to dish out...but that isn't their fault. I think the price was reasonable and the service was excellent. I would recommend them!
Description of Work: Replaced HVAC unit for townhouse.

Rating CategoryRating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro
$3,500

Sharon T.
04/2014
5.0
heating & air conditioning/hvac
  + -1 more
The technician arrived on time and was friendly and quick. He cleaned the unit, performed the check, and was done in less than a half an hour. He didn't try to sell me any bogus tune ups or washes. Mannix was recommended by my home inspector, and I plan to use them again.
Description of Work: Routine AC maintenance.

Rating CategoryRating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro
$90

Paul G.
04/2014
5.0
heating & air conditioning/hvac
  + -1 more
Both technicians and office staff courteous, professional, and helpful throughout process.
Description of Work: Furnace stopped producing heat. Called them Saturday morning; technician was at house within 3 hours. Technician arrived on time. Promptly identified faulty part and called office. Since they didn't have the part on-hand (furnace is 17 yr old), had to order it Monday. Called to schedule installation as soon as part came in. Again, technician arrived on time and completed work promptly.

Rating CategoryRating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro
$285

Gary Z.
04/2014
4.0
heating & air conditioning/hvac
  + -1 more
I've been happy with Mannix Heating & Cooling. I have used them a few times. They came fairly quickly and solved the problem. It's more expensive than I really like. The work they did was good.
Description of Work: They repaired my heater.

Rating CategoryRating out of 5
quality
5.0
value
3.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro
$160

Christina C.
04/2014
5.0
heating & air conditioning/hvac
  + -1 more
We called the company for an estimate for a new furnace and AC unit and they were able to set up an evening appointment for us, which is hard to get from many HVAC companies. Patrick came on time and was extremely professional. He answered our questions, made suggestions, and explained options without ever giving us the "hard sell" or trying to pressure us into anything. He left us detailed information and followed up with additional information and was responsive to questions we asked via phone and email. Mannix prices were also very competitive. They weren't the cheapest estimate we got but with their warranty, good reviews and our interactions with Patrick we felt confident that Mannix was the best purchase. The install went very well with the techs also being very professional and efficient. There was a slight mix-up with a thermostat and when we called Patrick to inform him of this he had not problem sending out someone to get it switched to the correct item. We have nothing but good things to say about the company and are extremely happy with our decision to purchase from Mannix.
Description of Work: New furnace and AC unit purchased and installed

Rating CategoryRating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro
$7,500

DON B.
04/2014
5.0
heating & air conditioning/hvac
  + -1 more
He told me the job should take 2 hours approximately. Matt and Billy arrived on time. Billy explained what they were going to do. He said the job should take 2 hours. Both Matt and Billy wore shoe covers so as not to track dirt into the house, they also laid canvas floor coverings from the back door all the way into the basement. The install took 2 hours exactly. During the install both men hardly spoke to one another. One would hold out his hand and the other would hand him the part he needed. Billy said they had been working together for 9 years, so they thought as one. The install went perfectly. We had a 6 year warranty on parts and 1 year on labor. Mannixe finest company we have dealt with. I'd recommend them to anyone
Description of Work: Installed new 80 gallon electric hot water heater.

Rating CategoryRating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro
$1,395

Matt J.
03/2014
5.0
heating & air conditioning/hvac
  + -1 more
The whole process was very smooth from the estimate, discussion of options, scheduling the work and the actual work itself. Very professional staff who left everything in perfect shape and 100% clean.
Description of Work: Installed a new heating and cooling system.

Rating CategoryRating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro

Lori G.
03/2014
5.0
heating & air conditioning/hvac
  + -1 more
Mannix sent a service technician right away. Unfortunately, as we suspected, our very old unit had to be replaced. A salesperson came first thing Satuday morning and it was installed Monday morning. We didn't get competitive bids due to the heat and timing of the occurrence but felt it was a fair price. We discovered we got an even better price than our neighbors who had a couple of estimates. Highly recommend Mannix!
Description of Work: We came home from a trip at 4pm on a blistering Friday afternoon to discover our air conditioner not working. Many places were already closed for the weekend.

Rating CategoryRating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro

Alina S.
03/2014
5.0
heating & air conditioning/hvac
  + -1 more
After the service contractor that installed original units in new construction townhouse (2001) explained that A/C was on its last legs and could go at anytime, and that heating was not too far behind, obtained several estimates for replacement of both units. Mannix offered a competitive bid for Carrier products which was helped by some company discounts being offered at the time of installation. Mannix was flexible with their schedule and we established a mutually-agreeable date for the one-day job; I wrote them a check for 1/3 deposit in advance (more on that below). Mannix determined that they would need to rent a crane in order to lift and place the A/C unit in back yard (we have a detached garage). On the day of the install, employees arrived on time, ready to do the work. The crane, however, did not show up; we later learned that there had been a snafu with scheduling it. As a result, they took care of everything else that they could minus the A/C install, including install of heating unit, replacement of humidifier, additional duct work and vent in the second floor closet and hallway, install of new thermostat pad, etc. They agreed to reschedule the A/C install one week later; correctly they did not take the check I had written for the remaining 2/3 balance stating that they would take the check once all of the work was completed. (I was disappointed that they could not finish the job in one day, as it required us to take off from work two different days). On the following Monday they returned, were early, the crane arrived, and the job was completed within a couple of hours, at which time they took the check for the 2/3 balance with them. Employees were very efficient, competent and professional, they worked cleanly, and hauled all old equipment away. Heating unit is much more efficient, runs more quietly and overall temperature in house appears to be more even among the three floors -- which was another goal. After the job was finally completed, I was contacted by Mannix because there had been a snafu with the original 1/3 deposit check -- it had been mailed to their Virginia office, but somehow never received. They requested I stop payment on the first check, and write them a new check minus the stop-payment fee my bank would charge -- I thought that was fair and did so the same day. Mannix also offered a one-year service contract as part of their package install, so I will continue to rely on them to service the new units 2014-2015.
Description of Work: Replaced 12 1/2-year old Heating and A/C units and central humidifier

Rating CategoryRating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
4.0

Yes, I recommend this pro
$10,000

John D.
03/2014
5.0
heating & air conditioning/hvac
  + -1 more
Spoke with two contractors and Mannix contacts were quick at following up. In short, the put a new unit in a day after the contract. Installers were professionals, worked non stop to finish in one day. Very pleased.
Description of Work: We needed to replace a very old heating/air unit

Rating CategoryRating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro
$8,300

Adam T.
03/2014
5.0
heating & air conditioning/hvac
  + -1 more
I've fought with my boiler for many years and had trouble finding someone who could diagnose the problems correctly. I really liked Dave -- clearly knew what he was doing. He diagnosed the problem quickly and replaced the valve quickly (less than an hour) the next day. They were very easy to schedule. They were available to come out the same day I called. They gave me a call 30 minutes before arriving, which is much more convenient for me than expecting me to sit home for a four hour window as is common for other repair services. The original quote for the repair was $575 but Dave knocked off $100 because the repair went so well and they found the part at a wholesale price. I appreciated this. They don't itemize the costs (labor, parts, etc.) but they do clearly communicate the price in advance so there are no surprises. The cost of the second visit did seems slightly high to me, even with the $100 discount, but I was still happy to pay it since they did such a great job.
Description of Work: My boiler wasn't firing up so I called Mannix to diagnose and resolve the problem. Dave made two visits. One to diagnose the problem, a bad solenoid in the gas valve that wasn't opening, and the second one to replace the valve. The diagnostic visit cost $109.95 and the replacement visit cost $475.

Rating CategoryRating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro
$585

Indranil B.
03/2014
5.0
appliance repair, heating & air conditioning/hvac
  + 0 more
work was performed by Jeremy and Melvin. they were very professional and work very diligently to get the task completed on time. Jeremy was kind enough to removed all the old cable and an old dish satellite that was near the heat pump. I'm very happy with Mannix and the work they've performed. I hope that they are equally responsive if there are any future issues with the unit, although I hope not to see them other than the scheduled maintenance.
Description of Work: replaced my air handler and heat pump

Rating CategoryRating out of 5
quality
5.0
value
4.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro
$6,100

Lisbeth C.
03/2014
5.0
heating & air conditioning/hvac
  + -1 more
Mannix Heating and Cooling was great! Both servicemen were right on time, very organized and had everything ready to go. They answered all of my questions. They did not attempt to sell me anything extra and they ensured both units were working properly.
Description of Work: Mannix Heating and Cooling cleaned and checked my heat pump and heater.

Rating CategoryRating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro
$189

Liesel G.
03/2014
5.0
heating & air conditioning/hvac
  + -1 more
Arrived on time and took all precautions in the house. Spotless! Completed all the work in one day as promised. Price was excellent - all discounts were outlined even the ones from the gas and power company. Very responsive to all my questions and requests for numerous options.
Description of Work: Replaced entire heating system - one gas furnace and one heat pump..

Rating CategoryRating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro
$13,000

Kristen Y.
03/2014
5.0
water heater repair
  + -1 more
I had a water heater leak on a Saturday morning. Patrick came out promptly and ordered me a new water heater. To expedite things, he arranged to have the water heater installed the same day. To make sure that everything went as planned, he ran to the distributor to reserve a tank. He even helped me drain it.
Description of Work: Outstanding service. Extremely helpful, knowledgeable and professional.
Rating CategoryRating out of 5
Yes, I recommend this pro

Marie M.
02/2014
5.0
heating & air conditioning/hvac
  + -1 more
My old heat pump was failing so I interviewed 3 companies for the job, including Mannix Heating and Cooling. I had been getting conflicting information on what size unit I needed (1-1/2 ton versus 2 ton) so I was very happy when the salesperson, Patrick Horan, did an excellent job of explaining what I needed and why. He did not try to push items on me to buy that I did not need and was very honest and open. The price seemed in line with bids I was getting from other companies. In the end, I decided to go ahead with Mannix and the install happened the very next day. The install team arrived promptly on time and did an excellent job, (sorry I forgot their names again..). They installed the new heat pump and a new programmable thermostat. They were very careful to have their shoes covered when inside the house and were very polite, professional and respectful which I really appreciated. They finished the job in about 5 hours and cleaned up the work area and took all the old equipment. The installer also took the time to explain the programmable thermostat and explained the importance of changing the filters regularly. What even impressed me more was the salesman dropped by towards the end of the install just to check on things and answer any questions I may have had. Overall I was very impressed with this company.
Description of Work: Installed new heat pump and programmable thermostat

Rating CategoryRating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro

James G.
02/2014
5.0
heating & air conditioning/hvac
  + -1 more
The technician came in and knew right away it was a capacitor and replaced it within a half an hour. Great service - I'll will use again.
Description of Work: They responded on short notice during 90+ heat after my first call to another company failed to show up. I had an outside fan motor that would not spin up.

Rating CategoryRating out of 5
quality
5.0
value
4.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro
$100

Richard S.
02/2014
5.0
heating & air conditioning/hvac
  + -1 more
My husband used them and he was very satisfied. He recommended them to our neighbor. We will use them again. Everything was included in the price. We would use them again.
Description of Work: Mannix Heating and Cooling installed heating, air conditioning and ventilation system.

Rating CategoryRating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro
$13,000

richard A.
02/2014
5.0
heating & air conditioning/hvac
  + -1 more
The service was excellent from top to bottom. I would highly recommend.
Description of Work: Installed heating and air conditioning unit.

Rating CategoryRating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro
$7,000

David P.
02/2014
5.0
heating & air conditioning/hvac
  + -1 more
Very pleased with both their original installation and their servicing since then.
Description of Work: The recently serviced the new Carrier Infinity system we purchased a year ago.

Rating CategoryRating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro

Andrew A.
02/2014
5.0
heating & air conditioning/hvac
  + -1 more
I called Mannix for an estimate, Hal showed up and provided me with options, and called him back a few days later to schedule an install. They setup the installation for the following day. Two installers arrived, setup the system in about four hours, and showed me how to use the programmable thermostat. I was impressed with the quality of their installation. So impressed that I may switch my service contract from Snell to Mannix. I went with Mannix because of their advertised NATE certification and because they were an authorized Carrier dealer. Before selecting Mannix, I interviewed three other companies and Mannix was the clear choice. I would definitely do business with them again.
Description of Work: Mannix installed a new Carrier heat pump and air handler. I went with the 13 SEER model.

Rating CategoryRating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro
$5,300

Steven H.
02/2014
5.0
heating & air conditioning/hvac
  + -1 more
Mannix Heating and Cooling is the Rolls Royce of HVAC companies. We interviewed several other companies before making a careful and deliberate decision. A major factor we took into consideration is that we wanted to find one company we could completely trust to do a fine job initially and then keep the same company for many years afterward. Mannix fit the requirements perfectly. Bill Blair was our initial contact, a very personable, thorough and caring sales representative. He was unfazed by our many questions and I feel we were given honest answers. Jerry Mannix, the owner of the company actually stopped by to see if we had questions or concerns for him. I liked his no-nonsense, knowledgeable and informative personality immediately. Before he and Bill left, we went with them to check that the flue was properly venting and Mr. Mannix looked the furnace over to be sure further alterations would not be needed in the furnace room. This company is so respectful of your property. Non-installation personnel, including the owner, will not park in your driveway; they park in the street. They are not permitted to smoke on the premises and their language must be child-friendly at all times. I completely trusted the installers. They arrived well-prepared, knowing exactly what they were to do and after only a few moments of conversation with me, they went right to work. I heard not a word from them until they were finished. There was also a wonderful lack of non-essential cell phone calls. They worked quickly, QUIETLY and efficiently. When the work was completed, after many hours, they spent plenty of time with me explaining how to use the new thermostat. I never felt rushed or that they were in a hurry to leave. Every person I came in contact with from this company took their time answering my questions, making sure I understood their answers completely. Two more things to mention among many other positive comments I could make: There was a small gas leak in the furnace room. I had called the gas company to find the leak. Of course the gas was turned off and I was in a panic to find someone to fix it. Jerry Mannix said his company would fix it and charge a small service fee, so I was very pleased. A personable and kind gas expert was sent to repair the pipe. In addition to fixing the leak, he found some unused and unnecessary pipes that he removed and told me to give them to the installation crew for disposal. He refused payment, telling me that we were getting a new system and he was happy to help. Several weeks after the installation, I was on the deck and noticed the new exhaust vent piping. I had not known that the old, worn and incorrectly installed original piping would be replaced. I was glad to see more evidence of a high quality, thorough and expert job. I waited before submitting a review to be sure the pieces we ordered were everything they said they would be. I could not be more pleased with our new system and our new highly trusted HVAC contractor. I expect to use this company for a very long time.
Description of Work: Installed all-new Carrier furnace, Carrier high-efficiency air cleaner, Air Knight UV air purifier, A.O Smith water heater

Rating CategoryRating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0

Yes, I recommend this pro
$8,525

Contact information

26955 Gum Spring Rd, Chantilly, VA 20152

http://www.mannixhvac.com

Service hours

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

Licensing

Bonded

Insured

Licensed*

Trade License Number
2705135017
Trade License Locale
VA
Trade License Authority
Virginia Department of Professional and Occupational Regulation
Trade License Expiration
05/31/2024

Eco-friendly Accreditations

LEED Accredited Professional
No
Energy Star Partner
No
EPA Lead-Safe Certified
No
Use Green Products or Work Practices
Yes
State Contractor License Requirements

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
Yes, Mannix Heating & Cooling offers free project estimates.
Yes, Mannix Heating & Cooling offers eco-friendly accreditations.
No, Mannix Heating & Cooling does not offer a senior discount.
Yes, Mannix Heating & Cooling offers emergency services.
Yes, Mannix Heating & Cooling offers warranties.
Mannix Heating & Cooling offers the following services: Heating & air conditioning - repair, replacement & installation, water heaters, humidifiers. Electrical - upgrades, generators. Service agreements
Window Units, New Construction HVAC Systems, Oil Furnace Repair

Contact information

26955 Gum Spring Rd, Chantilly, VA 20152

http://www.mannixhvac.com

Service hours

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