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
14 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
Description of Work: Fixed the problem right away and didn't charge more than the $29. Fantastic service and very honest.Excell
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
$29
Dan Z.
01/2014
5.0
heating & air conditioning/hvac
+ -1 more
.
Description of Work: Service the furnace to make sure it was ready for the winter.
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
OCTA W.
01/2014
5.0
heating & air conditioning/hvac
+ -1 more
Everything went extremely well.
Description of Work: Installed new heating & AC.
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
$7,000
Daniel K.
01/2014
5.0
heating & air conditioning/hvac
+ -1 more
.
Description of Work: Replaced 14 year old furnace/air conditioning system and performs semi annual maitnance.
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
Gerard F.
01/2014
5.0
heating & air conditioning/hvac
+ -1 more
Very well
Description of Work: Fall checkup of two furnaces
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
$139
Brian B.
01/2014
5.0
heating & air conditioning/hvac
+ -1 more
Replaced 2 air conditioners.
Description of Work: I used Mannix Heating and Cooling.
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
$6,500
Yvonne S.
12/2013
5.0
heating & air conditioning/hvac
+ -1 more
.
Description of Work: Performed maintenance service on the heating and air conditioning system. Resolved problems with noise and made necessary adjustments.
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
$179
Scott P.
11/2013
5.0
heating & air conditioning/hvac
+ -1 more
.
Description of Work: Mannix replaced a circuit board in my furnace and performed routine servicing. They were timely, polite, on budget and delivered as explained.
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
$300
Jiri D.
10/2013
5.0
heating & air conditioning/hvac
+ -1 more
Very knowledgeable
Description of Work: HVAC maintenance
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
$300
Ravic N.
10/2013
5.0
heating & air conditioning/hvac, water heater repair
+ 0 more
.
Description of Work: Installed new HVAC
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
$3,500
Paola B.
09/2013
5.0
heating & air conditioning/hvac
+ -1 more
Great!
Description of Work: Identified my problem and since it was an easy fix, they didn't charge extra.
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
doruk E.
08/2013
5.0
heating & air conditioning/hvac
+ -1 more
They did a decent job.
Description of Work: They came and fixed my AC.
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
Jamal H.
08/2013
4.0
heating & air conditioning/hvac
+ -1 more
unknown
Description of Work: I bought a Big Deal from them for a heating or cooling diagnostic service call.
Rating Category
Rating out of 5
Yes, I recommend this pro
Andrew G.
05/2013
5.0
heating & air conditioning/hvac
+ -1 more
unknown
Description of Work: Had Mannix service come out to proactively check my HVAC system this morning and was very please that my service tech was very thorough with my system. I definitely noted his attention to detail considering the past companies I've used (Parrish, I'm looking at you). He was very punctual and was open and honest with my system, didn't try to sell me anything I did not need. I have no hesitation in recommending Mannix and will use them for my future needs. Very well done!
Rating Category
Rating out of 5
Yes, I recommend this pro
Ramesh G.
04/2013
3.0
heating & air conditioning/hvac
+ -1 more
It went well
Description of Work: Check up and estimation of Heating and A/C
Rating Category
Rating out of 5
quality
2.0
value
2.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
$29
Deborah D.
04/2013
5.0
heating & air conditioning/hvac
+ -1 more
great..quick visit
Description of Work: He found the service manual accidentally left in the 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
$30
Linda H.
03/2013
5.0
heating & air conditioning/hvac
+ -1 more
It went great!
Description of Work: Mannix performed a diagnostic of my father's furnace. He suffers from mild dementia and I couldn't be there during the appt. They called while there and were very patient with my father. The 25 year old furnace hadn't been serviced or cleaned in many years. They changed the filter I purchased from them. They were fantastic.
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
$80
Nicholas P.
03/2013
1.0
heating & air conditioning/hvac
+ -1 more
Not what I expected
Description of Work: I bought two of the 49$ cleaning deals. One for AC and one for Furnace. The tech came in knowing it was for a cleaning. I was told my furnace needed to be replaced that the coils were too dirty and it wasn't worth cleaning. He looked at the AC and I don't have outside water in the back of my unit so he said he wasn't able to clean it without outside water. He spent some time with my furnace opened up, yes its old, yes it should be replaced, but I bought two deals for cleanings and nothing was cleaned. He basically just inspected my units and gave me his opinion on what to do. I found coil cleaner at home depot and did it myself. Watch the youtube videos before having a "professional" come clean your coils.
Rating Category
Rating out of 5
quality
2.0
value
1.0
professionalism
3.0
responsiveness
5.0
punctuality
5.0
$100
Response from Mannix Heating & Cooling
When we arrived at this members home on January 30, 2013, our tech found a 20-year old water source fan coil with a through the wall First Company A/C unit. Our tech found both the refrigerant coil and the water heating coil located in the fan coil totally matted with dirt. He also found the outdoor A/C unit coils heavily matted with dirt. This type of cleaning is more labor intensive and requires chemical cleaning of the coils. This type of coil cleaning is not covered under a standard maintenance visit. The member was quoted between $250-$300 for the coil cleanings, and we recommended cleaning the outdoor coil in the Spring when the outdoor faucet was available. According to our records, we did check the amperage draw on his circulator pump (.65 amps), blower motor (6.3 amps) and measured supply and return temperatures (113 and 73 degrees). We also tried to locate the heat source for the water coil (normally a water heater) but were unable to locate it. It is most likely tied to a central boiler for the building. Since this customer purchased two $49 coupons from Angie’s list, we offered to come out again in the Spring when we could clean the outdoor unit coil and properly test the refrigerant level, even though the coupon expired March 31st. After reading this review, I have tried several times to contact this member directly to see what we could do to make things right, but as of this writing, my calls have not been returned. I have since mailed the member a check for $98 to refund him for the two service coupons.
David P.
01/2013
5.0
heating & air conditioning/hvac
+ -1 more
see above
Description of Work: Mannix Heating & Cooling is a first class provider and provides very good value for your money. I had 2 new hybrid HVAC units (heat pump with nat gas/propane backup) installed in our home in Dec 2011. I waited for the first year to roll by before writing this entry to ensure all was as promised. I am very satisfied with both the installation and the seasonal servicing since that time. Jerry Mannix (the owner), the installation technicians, and the servicing techs since then have all been consistently knowledgeable, timely, polite, and effective with any follow up. We had our 1 year servicing this morning. They know their products well (primarily Carrier) and do not oversell vs your needs. Price was not the lowest, but was solidly competitive and the knowledge/service was clearly superior (I had two different local providers in prior 10 years before this upgrade installation). I would and have recommend this firm to others that I know (and this is not very common for me). Suggest you give Mannix a look if you are in the market for HVAC....best of luck.
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
$20,000
Karen C.
12/2012
5.0
heating & air conditioning/hvac
+ -1 more
Great job
Description of Work: Checked the heating unit. Installed a new thermostat.. Please with service because they didn't try to upsale
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
Susan T E.
12/2012
5.0
heating & air conditioning/hvac
+ -1 more
Please see above.
Description of Work: Mannix Heating & Cooling installed an entire heating/air conditioning system in our 70-year-old home, which, prior to this new heat pump system, only had two small propane "fireplaces" and 4 noisy window air conditioners as its system. Mannix had to create all ductwork & vents (in our attic - we have no basement); broke through an unused chimney to vent the new system; created the necessary gas and electric modifications; etc. Jerry Mannix, reportedly an 18+ year veteran in the HVAC business, who only just started his own company about 3 years ago, obviously knows what he's doing and does it well. His very personal involvement with the estimate; his patience with my multitude of questions regarding the pros/cons of the various choices; and the excellent staff he sent to do the two-day job, confirmed my initial feeling that this was the company to go with -- I can easily see why Mannix earned a Super Service Award almost immediately after being listed on Angie's list. I was also impressed with Jerry's honesty when, in telling him the two companies my choice came down to, he openly noted the other was also an excellent, reliable, honest choice should I have gone with that company (another Angie's List Super Service company). Mannix' pleasant and polite crew, led by a Melvin, with the gas work and thermostat orientation done by an equally excellent Ruben, was very conscientious about cleaning up as they worked and at the end of every afternoon. My husband, a construction development consultant who, himself, has been a contractor, is very particular about who does work in our home; he, too, was very pleased with Jerry's expertise and the crew's skillful and conscientious performance of their duties. We're considering replacing our hot water furnace soon -- Mannix will no doubt be the company we choose to do the job.
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
$14,000
Jessica T.
12/2012
5.0
heating & air conditioning/hvac
+ -1 more
Honest and upfront.
Description of Work: called for a Gas leak on my Fireplace. Rep who answered was honest and upfront on the fact that they don't work on the units themselves, so appreaciate that!!
Rating Category
Rating out of 5
professionalism
5.0
responsiveness
5.0
Yes, I recommend this pro
William & Susan H.
11/2012
5.0
heating & air conditioning/hvac
+ -1 more
Overall the service was great.
Description of Work: HE came out to do a yearly clean up on the furnace.
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