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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 651-675 of 736 reviews

Thomas C.
09/2014
5.0
heating & air conditioning/hvac
  + -1 more
unknown
Description of Work: Replaced outside condenser unit of an air conditioner

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
$5,000

Alan N.
09/2014
5.0
heating & air conditioning/hvac
  + -1 more
unknown

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

Cristina D.
08/2014
3.0
heating & air conditioning/hvac
  + -1 more
unknown
Description of Work: I hired Mannix to replace the HVAC unit at my condo. On a positive note they were very responsive, their pricing was competitive and they were able to complete the replacement quickly. My unit is a split electric/gas system and after the installation they did not verify that the gas was venting correctly. As a result the first evening after its installation my carbon monoxide detector went off after midnight causing an evacuation and it was very scary. Furthermore had I not been home it would have killed my pet who would not have had a way to escape when the alarm sounded. Mannix ultimately fixed the issue and the owner came out personally but the episode was scary and it is my opinion that any contractor working with gas systems should take further precautions to ensure carbon monoxide levels are within range after the work's completion. I chose Mannix because they had good ratings on Angie's List and this may have just been an isolated incident.

Rating CategoryRating out of 5
quality
3.0
value
4.0
professionalism
4.0
responsiveness
5.0
punctuality
5.0

$5,000

Ellis M.
08/2014
5.0
heating & air conditioning/hvac
  + -1 more
unknown
Description of Work: We have been using Mannix for our AC repair, installation and service for several years now. They are always extremely responsive and professional. Jerry Mannix personally supervised the installation of a new AC unit and gave us an excellent deal. Last summer that new unit went out on a hot July 4 holiday weekend when we had guests staying at the house. A Mannix technician came out within an hour to fix the minor wiring problem. There was no charge and he refused a tip for coming out on a holiday Sunday. I highly recommend this company.

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
$8,000

Nancy J.
07/2014
5.0
heating & air conditioning/hvac
  + -1 more
unknown
Description of Work: Repaired our air conditioning. Had other quotes. Best price and most knowledgeable.

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
$5,000

Kelley D.
07/2014
5.0
heating & air conditioning/hvac
  + -1 more
unknown
Description of Work: Installed a new heat pump and air handler. Great customer service. Very professional.

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
$7,000

David E.
06/2014
5.0
heating & air conditioning/hvac
  + -1 more
unknown
Description of Work: Mannix replaced our furnace, AC unit /coil and hot water heater. Their salesman was pleasant, informative and not pushy. The installers were very prompt. They made a big effort to keep our house clean, and they spent time explaining the new features of the system to my wife. An excellent experience!

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
$13,000

Michelle V.
06/2014
5.0
heating & air conditioning/hvac
  + -1 more
unknown
Description of Work: Mannix actually came out twice, the first was for water leaking from our AC unit in our basement. It turned out that there was a clog in our humidifier drain. They fixed the clog and they didn't charge me as it should have been found when they did the maintenance. I had them come back out a few days later because our AC wasn't putting out cool air. They once again came out the same day I called and discovered I have a leak in the coolant line. Each time the tech has been friendly and efficient.

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
$160

ARCHIE M.
06/2014
5.0
heating & air conditioning/hvac
  + -1 more
unknown
Description of Work: Mannix turned on the heat to my water heater, which some how had stop working. Within 15-20 minutes of the repairman's arrival, the problem had been resolved. Highly recommended company. BYW, Mannix also installed by carrier furnace and water heater two years 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
$90

Daniel B.
06/2014
5.0
heating & air conditioning/hvac
  + -1 more
unknown

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
$120

Bellore R.
06/2014
5.0
heating & air conditioning/hvac
  + -1 more
unknown
Description of Work: Replaced outside airconditioning unit for a small condo. Professionally dne, arrived on time, knew what they were doing and after they completed the work they stayed around to make sure everything for fine

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

$3,600

Ann M.
06/2014
5.0
heating & air conditioning/hvac
  + -1 more
unknown
Description of Work: They replaced a part in my ac unit. The AC mechanic arrived on time, was pleasant and knowledgable, and patiently answered my questions. Because they had serviced other units in my condo building, they were familiar with the unit and the repair went very quickly. Excellent service.

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
$150

Barbara K.
06/2014
5.0
heating & air conditioning/hvac
  + -1 more
unknown
Description of Work: New HVAC unit installation and flollow ups

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

Daniel B.
06/2014
5.0
heating & air conditioning/hvac
  + -1 more
unknown

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
$75

Alan R.
06/2014
5.0
heating & air conditioning/hvac, water heater repair
  + 0 more
unknown
Description of Work: My entire HVAC system was replaced as was the water heater and sump pump. I only dealt with Jerry Mannix who I found to be honest, reliable and fair in his appraisal of my HVAC needs and fair in the pricing of a 2 zone system plus other items. I would definitely recommend this vendor to others in need of these services

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
$14,000

Ann V.
06/2014
5.0
heating & air conditioning/hvac
  + -1 more
unknown
Description of Work: Mannix installed my Unittwo years ago. I purchased a service agreement with Mannix for 175.00 a year. They make two visits per year. They did a Maintenance Service in April 2014. The Tech was on time. He covered his shoes before stepping on my carpet. He checked system inside and outside. Answered questions I had. I am pleased with their work. I will continue to use them, and would recommend them.

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
$87.5

Russell H.
06/2014
4.0
heating & air conditioning/hvac
  + -1 more
.
Description of Work: Mannix installed a high efficiency furnace, with humidifier and whole house air filter. My overall review is, communication between sales, office staff and workers is very poor. The price was decent, and general quality good but lack the attention to detail. It was a hassle to make sure they followed through with all they said they would. | |In the fall we had our old furnace serviced and learned it was no longer usable. We got quotes and signed the contract with Mannix on a Thursday. We did not have heat, but were able to keep the house warm with alternate sources over the weekend (50 degrees outside). I was told they would arrive Monday between 8 and 9 am since the work would take at least 6 hours. There was poor communication between the sales guy and the office. After a few phone calls Monday morning they finally arrived after 1 pm. Finally around 6:30 or 7 pm, they were hurrying to finish and it caused sloppy work. They tried to show me finished pipes for the humidifier before the glue was dry and it fell apart as we looked at it. They told me that the bottom air return needed a different part for them to install the air filter, so they would have to return another time to finish. When I asked why only one PVC pipe was installed instead of the two I was told would be, they told me it was safe with only one. They asked for entire payment, and I had to tell them I would not pay the $250 for the air filter until it was installed. They left the property only to return a few minutes later because both workers thought the other had finished sealing off the chimney that was no longer used. | |After a such a poor experience I immediately called and spoke to the owner. He was extremely responsive and immediately drove to my house to inspect the work done. I explained that the sales guy told me there would be 2 PVC pipes leading to the outside, one for the intake and a second for the exhaust. However, the workers only installed one PVC pipe. He assured me that one was safe, but since I was told two they would fix it and install two. The problem was, the sales guy had not properly measured the room and they didn't have enough PVC pipe in the truck for two. He promised to make it right for me with his best crew and offered me a one year service contract free of charge to make up for the experience. When they came back and fixed the furnace they installed the second PVC pipe, air filter, and even fixed a patched hole in the hot water flue. They were early and extremely polite. They clearly were working very hard to make me happy. When I went to pay them for the remaining $250 for the air filter, the worker told me no more payment was required. I told him, that I still owed for the air filter. He texted the office and received a text back that said do not collect any payment. I double checked with him and he said he was sure, so off he went. A few days later I receive a bill for the $250 balance. I was super annoyed at this point. We called and explained what we had been told and they waived the remaining balance. | |Now I thought that since he knocked money off the total, we wouldn't still get the service contract, but we did. They called and set up an appointment. I explained that I worked in the AM, but could be home by 2 pm any day, so we set up a day. When I arrive home at 2, there is a message saying they arrived at noon and waiting 20 minutes and then left since I wasn't there. Again i was super annoyed the office staff had not clearly given all the details to the technicians. I had purchased replacement air filters and left them near the furnace. When they came to service the furnace, he said "I used the air filters you had, that ok?" I had sort of assumed that I would need to supply them. In the fall, I hadn't realized both the furnace and the humidifier needed to have the filter replaced. He told me this time, that he used the air filter I purchased but installed his own for the humidifier. Here I was wondering if he would charge me for the filter he installed, but he didn't. So then I wondered if the service contract was supposed to include the filter, when I had already purchased them. He leaves and for the next three weeks the house is extremely dry. I finally think to check the humidifier and find that he never turned it back on and it was off for a month. That's when I decided that the service contract wasn't worth it. | |Now fast forward 6 more months, and we have a energy audit and learn that the since the new furnace no longer uses the old chimney, and only the gas hot water heater does, this is potentially dangerous. I was told they should have done a safety check called CAZ (combustion appliance zone testing). Basically they orphaned the hot water heater as it was the only appliance connected to the chimney. Then we replaced the hot water heater and the plumber points out that they didn't put any covers over the PVC pipes on the outside and a child could easily drop a ball or small toy down the exhaust pipe (it's at child height) and that could cause a block in the exhaust! Good point, so for $2 we bought cover at home depot.

Rating CategoryRating out of 5
quality
4.0
value
5.0
professionalism
3.0
responsiveness
5.0
punctuality
1.0

$4,200

Le-Thuy P.
06/2014
5.0
heating & air conditioning/hvac
  + -1 more
unknown
Description of Work: I was very pleased with the professionalism, expertise and courteousness of Mannix 's representative and technicians. I will not hesitate to use their service in the future and will definitely refer Mannix to friends and family. | |This will serve as a big "thank you" to people who |care and who are proud in what they are doing

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

Yes, I recommend this pro
$9,500

Josh R.
06/2014
5.0
heating & air conditioning/hvac
  + -1 more
unknown

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

Yes, I recommend this pro
$8,500

Beth O.
06/2014
5.0
heating & air conditioning/hvac
  + -1 more
unknown

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

Yes, I recommend this pro

Kaylin C.
06/2014
5.0
heating & air conditioning/hvac
  + -1 more
unknown
Description of Work: The Mannix team installed a completely new HVAC system -- furnace, ductwork, A/C unit -- the works. They were very punctual throughout the process.

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

Ray K.
06/2014
5.0
appliance repair, heating & air conditioning/hvac
  + 0 more
unknown
Description of Work: I had Mannix replace my gas furnace and heat pump last August. They were very responsive and professional, I couldn't be more pleased with their work and would recommend them.

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

Sabrina R.
06/2014
5.0
heating & air conditioning/hvac
  + -1 more
unknown
Description of Work: Just had an estimate for cooling system because we had some inefficiencies with our Central AC. Decided to not have work done right now, as we found the problem with our AC and fixed it ourselves. But very professional, knowledgeable and if we ever have another problem in the future, we will call.

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

Yes, I recommend this pro
$2,000

AJ B.
06/2014
5.0
heating & air conditioning/hvac
  + -1 more
unknown
Description of Work: Replaced faulty manufacturer's equipment. Mannix only charged the service and worked with the manufacturer directly to cover the costs of parts

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
$75

Dana L.
06/2014
5.0
heating & air conditioning/hvac
  + -1 more
unknown
Description of Work: They installed a new HVAC system including the AC unit, furnace, full house humidifier, and thermostat. The salesman who provided an estimate was punctual, knowledgeable, and gave us a great deal, including company, utility, and manufacturer discounts. The installers showed up on time and did a good job.

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
$6,600

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