Mannix Heating & Cooling, Llc
HVAC Services in Chantilly
Mannix Heating & Cooling, LLC specializes in Carrier HVAC installation, repair, and maintenance. Proudly serving Chantilly and the surrounding areas, we deliver reliable HVAC solutions to meet your home's needs.
Experience and Certifications
Experience and Certifications

NATE Dealer
North American Technician Excellence (NATE) is the leading certification program for HVAC technicians and is the only test supported by the entire industry. We are proud to employ NATE certified technicians.

Financing Available
We offer flexible financing options for your new Carrier product or system. With approved credit, you can enjoy convenient monthly payments, competitive interest rates, and online bill pay.

Cool Cash
We participate in Carrier Cool Cash rebates. With the support of Carrier, during select times of the year Cool Cash rebates might be available when you purchase a qualified Carrier heating and cooling system.

Indoor Air Quality Experts
Proper indoor air quality requires more than an air conditioner. As Carrier Indoor Air Quality Experts, we have completed coursework and passed a comprehensive test to deliver a cleaner, healthier home environment.

NATE Dealer
North American Technician Excellence (NATE) is the leading certification program for HVAC technicians and is the only test supported by the entire industry. We are proud to employ NATE certified technicians.
Financing Available
We offer flexible financing options for your new Carrier product or system. With approved credit, you can enjoy convenient monthly payments, competitive interest rates, and online bill pay.
Cool Cash
We participate in Carrier Cool Cash rebates. With the support of Carrier, during select times of the year Cool Cash rebates might be available when you purchase a qualified Carrier heating and cooling system.
Indoor Air Quality Experts
Proper indoor air quality requires more than an air conditioner. As Carrier Indoor Air Quality Experts, we have completed coursework and passed a comprehensive test to deliver a cleaner, healthier home environment.
HVAC Repair and Services

AC Repair & Service
We specialize in fast, reliable air conditioner repair and service to keep your home cool and comfortable. Whether it’s a minor fix or a major repair, we're here to ensure your AC runs smoothly when you need it most.

Furnace Repair & Service
We provide expert furnace repair and service. Our skilled technicians are ready to quickly diagnose and resolve any issues, keeping your home warm and comfortable year-round.

Heat Pump Repair
Count on us for dependable heat pump repair and service to keep your home comfortable year-round. Our experienced technicians troubleshoot issues, perform timely repairs, and ensure your system is operating at its highest efficiency.

HVAC Maintenance
We offer annual HVAC maintenance to keep your system running efficiently and help prevent unexpected breakdowns. Through a thorough inspection and tune-up, we ensure your heating and cooling system is ready to keep you comfortable all year long.
HVAC Installation Services

AC Installation
Enhance your home’s cooling and energy savings with our expert AC installation services. We install high-performance Carrier air conditioners and customize each system to match your home’s needs, helping ensure dependable comfort all summer long.

Furnace Installation
Stay warm and worry-free with our professional furnace installation services. We’ll guide you in selecting the best Carrier furnace for your home and complete the installation with expert care and precision.

Heat Pump Installation
Upgrade your home’s comfort and efficiency with our professional heat pump services. Our team installs top-quality Carrier heat pumps and tailors every system to fit your space, delivering reliable performance through every season.

HVAC System Installation
We provide expert HVAC installation to keep your home comfortable year-round. Whether you're replacing your current system or installing HVAC for the first time, we'll help you choose the right solution for your needs and handle the installation with precision and care.
Trusted HVAC Professional in Chantilly
Mannix provides excellent, professional service on HVAC system and water heater replacement.
November 06, 2025
Everyone at Mannix has been cooperative, professional, knowledgeable, and helpful. Installing a new HVAC system and water heater is inherently stressful; Mannix made the process run as smoothly as possible.
Melissa
Expertise (5)
Solve Problems (5)
Service (5)
Great experience these last 2 years.
October 13, 2025
Mannix is the best! Techs are on time and know what they are doing.
Joe
Expertise (5)
Service (5)
Installation Experts
October 25, 2024
Their team was professional and extremely helpful from the sizing through the installation process. The install of two systems and the hot water heater was completed in one day.
Paul
Expertise (5)
Service (5)
Solve Problems (5)
Heat Pump Install
January 11, 2024
Installers did a great job. Showed us any instructions we needed.
Eileen
Expertise (5)
Service (5)
Solve Problems (5)
Great experience!
November 22, 2023
Excellent experiences with Mannix. Shout out to Rember, who was efficient and on time. The installation of my new system went great, and I would highly recommend this company. Thank you, Jerry Mannix. You run a great company!
Joe
Expertise (5)
Service (5)
Solve Problems (5)
Great Customer Service
November 10, 2023
Working with Mannix is a great experience. They replaced my AC unit several years ago and were efficient and honest. It was time to replace my furnance and they quickly provided several quotes, were responsive to my questions, and were able to get the equipment ordered and an installation appointment scheduled in about a week. Excellent service all around.
Deborah
Expertise (5)
Service (5)
Solve Problems (5)
Excellent service and installation
August 09, 2023
Mannix has provided excellent service on all my carrier systems.
Chris
Expertise (5)
Service (5)
Solve Problems (5)
New System Installation
August 09, 2023
All the representatives from Mannix were very knowledgable, professional and responsive
Lyn
Expertise (5)
Service (5)
Solve Problems (5)
Great service all around!
August 07, 2023
The team from Mannix was expert, timely, courteous, and professional. I'm glad that I chose them and will definitely be back.
John
Expertise (5)
Service (5)
Solve Problems (5)
Definitely REcommend
August 06, 2023
This went very well from beginning to end. Lots of knowledgeable people, and they came right back to solve a small problem.
Don
Expertise (5)
Service (5)
Solve Problems (5)
Excellent service! Super knowledgeable and nice folks to work with!
July 12, 2023
Removed old unit and installed new in a new spot. Did such a great job, def recommend.
Suzanne
Expertise (5)
Service (5)
Solve Problems (5)
Absolutely wonderful experience
July 12, 2023
Mannix heating and cooling is very professional and customer friendly. Jerry went out of his way to sell me the system that worked best for my house and budget.
Dave
Expertise (5)
Service (5)
Solve Problems (5)
Good People
July 06, 2023
Needed new a/c replaced. Gave honest prices, no upsells. Owner, sales, installers ,\& office personnel all great! Smooth stress free experience. Thank you!
Cindy
Expertise (5)
Service (5)
Solve Problems (5)
Replacement of my 2nd floor HVAC (AC, furnace and compressor)
June 30, 2023
Excellent work and pricing.
Joel
Expertise (5)
Service (5)
Solve Problems (5)
Good sales experience into a quickly scheduled professional install
June 11, 2023
Installed a new AC, and have been happy with the sales process, the AC itself, and the overall price and process. I evaluated five companies, and eventually went with Mannix for having a competitive price, without a lot of sales pressure or manipulative sales shenanigans, good company ratings, and a responsiveness to both email and phone. (In particular, a couple vendors (Snell especially) gave me high pressure sales nonsense, despite my being very clear about getting multiple vendor bids. The Mannix sales rep candidly gave me a competitive price up front, and didn't belabor the process with a bunch of unwanted talking points or tactics.) The techs came out a few days later, and in the course of a morning installed a 3 ton 16 SEER AC and furnace for my townhouse. They were done by the early afternoon. Heats and cools about two months so far without any issues. No complaints, happy customer.
Jason
Expertise (5)
Service (5)
Solve Problems (5)
Excellent customer service
June 08, 2023
Excellent communication highly recommend
Michelle
Expertise (5)
Service (5)
Solve Problems (5)
Couldn't be better
May 06, 2023
Everything went smoothly and everyone was polite and professional.
Ray
Expertise (5)
Service (5)
Solve Problems (5)
Very Positive Experience Highly Recommended
April 17, 2023
Contacted Mannix to request an estimate to replace two old and faulty HVAC systems. Their representative Eric Holzworth came by later that same day to size up the project and give me an estimate. I had had three other HVAC estimates done prior to contacting Mannix. After a few weeks of consideration I selected Mannix Heating \& Cooling for the project. Eric's professionalism, knowledge and expertise of the equipment, installation and detailed questions I asked was the best of them all and pushed it over the top. Two HVAC systems were installed on the same day, one 2 Ton Conventional blower and one 1.5 Ton Heat Pump system with Two Ecobee Premium WIFI Thermostats in a 4 storey building. Two installation crews arrived. The Journeymen and assistant for each crew were experienced professional and very efficient at installing the HVAC systems. Drop cloths were used when needed and attention was paid to prevent any accidental damage to floor, walls and several flights of stairs. After installation and prior to departure both systems were operationally checked to insure each HVAC system and its Thermostat control unit functioned properly and to answer any questions I might have. All in all, a very positive experience. I highly recommend Mannix Heating \& Cooling.
Alain
Expertise (5)
Service (5)
Outstanding!
December 01, 2022
3rd time I've used Mannix company and will continue to!!!
Jake
Expertise (5)
Service (5)
Solve Problems (5)
Trustworthy and Efficient
October 20, 2022
I literally had a Frankenstein unit that was in need of just retiring. Its never the right time, but I needed a whole new System and had a unique situation that needed looking at by the owner to assess. They determined our needs and gave us three choices to choose based on our budget. It is now installed and they were quick, clean and efficient. So far so good and happy to happy it done!
Brenda
Expertise (5)
Service (5)
Solve Problems (5)
Great pricing and good, prompt customer service
October 14, 2022
Same as title
Chander
Expertise (5)
Service (4)
Very satisfied - Mannix is my go to HVAC service/dealer
July 06, 2022
I've used Mannix for almost 20 years. Best dealer and service I've found. Top notch.
Ross
Expertise (5)
Service (5)
Solve Problems (5)
Great experience
June 22, 2022
Excellent service. On time and very professional. Site left clean.
Edward
Expertise (5)
Service (5)
Solve Problems (5)
Replacement of AC and Furnace
June 17, 2022
All\-around positive experience.
Chris
Expertise (5)
Service (5)
Solve Problems (5)
Excellent Service!!!
June 17, 2022
Excellent Service!!!
Carlos
Expertise (5)
Service (5)
Solve Problems (5)
Mannix H&C Furnace/AC Review
May 19, 2022
Excellent process from estimate to final installation. Very professional organization.
Stephen
Expertise (5)
Service (5)
Solve Problems (5)
Excellent
May 04, 2022
Experienced. Came in and installed new air conditioner and coil.
Jeri
Expertise (5)
Service (5)
Solve Problems (5)
Amazing customer service and quick, easy installation!
April 29, 2022
We had a wonderful experience working with Mannix. From the customer service reps on the phone, to the appointment scheduler and dispatcher, to the guys who physically installed our equipment, everyone was extremely friendly, helpful, and on\-time to make the process of replacing our HVAC system easy and stress\-free. I was very impressed with the professionalism of the guys who installed our equipment as well. They wore booties in the house as well as facemasks to ensure cleanliness and sanitation. We will definitely be using Mannix again!
Jordan
Expertise (5)
Service (5)
Solve Problems (5)
Amazing and seamless experience
March 25, 2022
the team was expert on what they are doing, plus seamless in work and on time . Also they explained what they did in details. thank you again for your service
Harsh
Expertise (5)
Service (5)
Solve Problems (5)
Excellent service
January 24, 2022
Excellent installation
Barbara
Expertise (5)
Service (5)
Solve Problems (5)
Efficient and covid cautious installation
January 20, 2022
Did a great with minimal disruption of heating and clean installation.
Johan
Expertise (5)
Service (5)
Solve Problems (5)
Outstanding Experience Across the Board
January 20, 2022
Helpful and informative involvement by owner, Jerry Mannix, throughout process. Super professional work on installation. Very competitive pricing. Would definitely use again and heartily recommend to others.
Robert
Expertise (5)
Service (5)
Solve Problems (5)
Outstanding Service
January 12, 2022
I have used Mannix Heating and Cooling for over 10 years. They installed my a/c unit in 2010 and recently installed a new furnace, humidifier and ecobee thermostat. I'm really happy with all three. What is most impressive is how quickly Mannix responded when my furnace just stopped working. A technician arrived in an hour confirming my 23 year old furnace's motherboard was not working. Within 48 hours Mannix came to my home and installed my new furnace right after the big snow. I am now happily warm. A big shout out to Jerry Mannix whose expertise and integrity I completely trust.
Nancy
Expertise (5)
Service (5)
Solve Problems (3)
Conversion from electric to gas heating
December 10, 2021
Jerry Mannix and his crew were professional, responsive and knowledgeable. I highly recommend Mannix Heating and Air.
GAIL
Expertise (5)
Service (5)
Solve Problems (5)
Exceptional customer service and installation
September 07, 2021
The staff was extremely friendly and worked with me. They explained it all and were extremely patient. Very clean and phenomenal installation.
Dora
Expertise (5)
Service (5)
Solve Problems (5)
Fair and Honest
August 07, 2021
Have used this dealer for all heating and cooling needs. Always fair and honest!
Amy
Expertise (5)
Service (5)
Solve Problems (5)
Despite supply-chain issues, amazing job!
August 02, 2021
Despite the supply chain issues of Summer 2021, Mannix was able to come out and diagnose the issue with my unit, and get an estimate set up the same day. When the A/C unit was on backorder for an extended period of time, Mannix was able to devise a workaround solution which met all of my requirements and performed the install quickly and flawlessly once the parts were acquired. Absolutely no complaints.
Andrew
Expertise (5)
Service (5)
Solve Problems (5)
A great job!
August 02, 2021
Jerry came to evaluate our situation \- I was very impressed with him: customer focused and obviously knowledgeable. Courtney, our scheduler, also handled everything in a professional manner under difficult circumstances (equipment was unavailable for several weeks). The installers, Billy and John, did everything smoothly and surprisingly quickly. It was great dealing with the pleasant and competent people at Mannix.
Gabriel
Expertise (5)
Service (5)
Solve Problems (5)
No one better
June 28, 2021
Installation was top notch!
BRIAN
Expertise (5)
Service (5)
Solve Problems (5)
Great customer service
June 25, 2021
I've been a loyal customer of Mannix for about 5 years. I can't say I've cost compared to speak to if they're the best bargain. They do, however, have high standard customer service which is reason enough for me to stay with them.
Jason
Expertise (5)
Service (5)
Solve Problems (5)
Excellent, quick, and clean install!
June 23, 2021
Mannix is excellent!
Michael
Expertise (5)
Service (5)
Solve Problems (5)
Outstanding 5-Star Installation and Service by Mannix Heating and Cooling - 2 full Infinity systems installed on the same day.
June 19, 2021
Mannix is Rated for the highest quality by Washington's Consumer's Checkbook Magazine for HVAC installation and service, and Mannix also is a Carrier Gold and Authorized Installer in Northern Virginia. I replaced my 20\-year old Carrier two full systems \- A/C and Heat Furnaces \- with Carrier Infinity Systems in June 2021. The Infinity Seer 26 systems are amazingily quiet and provide exceptional perofmrance. Hal Drake of Mannix quoted all matching Carrier components including A/C, Gas Furnace, coils, Infinity Thermostas, and Carrier Electrostatic filters. The only disappointment is the Carrier Infinity Thermostats are not as good as I had expected to be, and do not provide the flexibility what other Smart Thermostat provide. But Carrier and Mannix is a winning combination and Mannix installed two full systems with 2 crews in 4 hours correctly, on the same day. I highly recommend Mannix for any Carrier HVAC systems installations or service. Thank You.
MANOJ
Expertise (5)
Service (5)
Solve Problems (5)
Replacement went super smooth
June 17, 2021
Great product installed by professional and courteous technician s. Everything went as expected
ANDRE
Expertise (5)
Service (5)
Solve Problems (5)
Five Stars Plus Experience!!
June 11, 2021
It was a very positive experience dealing with Mannix from start to finish to get our new HVAC system. Customer service was very responsive. The installers were prompt on installation day and finished ahead of schedule.
Steve
Expertise (5)
Service (5)
Solve Problems (5)
Great Service and quick reposnse
June 09, 2021
The installation and finishing shows the maturity of this organization. Quick feedback when I had questions. Very pleased
Celso
Expertise (5)
Service (5)
Solve Problems (5)
Very Satisfied with the installation
April 29, 2021
I was very satisfied with the installation process. Technicians were on time; efficient and protected my floors. They explained what had been put in and how to use the new thermostat. The dealer was recommended to me by my project manager who had used them on prior occasions
Jean
Expertise (5)
Service (5)
Solve Problems (5)
Outstanding service and wrok.
April 21, 2021
On time and on budget. Friendly service people to work with.
Leif
Expertise (5)
Service (5)
Solve Problems (5)
Great company great service very happy
April 14, 2021
Awesome company, great service!
John
Expertise (5)
Service (5)
Solve Problems (5)
10-year satisfied customer
February 20, 2021
Always very responsive. Friendly. Customer\-focused. Purchased heat pump, furnace, and water heater from them, in addition to service plan.
Bill
Expertise (5)
Service (5)
Solve Problems (5)
Excellent company
February 10, 2021
Great service
Ken
Expertise (5)
Service (5)
Solve Problems (5)
Excellent Service
January 04, 2021
Very professional, clean and efficient. Great work!
Fraser
Expertise (5)
Service (5)
Solve Problems (5)
Excellent Service
December 11, 2020
Excellent, very punctual, efficient and knowledgeable.
Terrie
Expertise (5)
Service (5)
Solve Problems (5)
Always work with these guys
December 02, 2020
We have had them work at all of ou families homes. We never go with anyone else as we are so happy with their service.
KARIN
Expertise (5)
Service (5)
Solve Problems (5)
Very impressed from the owner of the company to the employees
November 20, 2020
I have been using Mannix Heating and Cooling for over 5 years for my HVAC service. The technicians that come to to my house are professional and experienced. They all love working for Mannix which speaks volumes about the company. My house is 20 years old and Mannix has installed all of my systems. I recommend to everyone I know to use this company. They take the time to explain everything and only recommend things that make sense for you and your family. You can trust these guys.
Bill
Expertise (5)
Service (5)
Solve Problems (5)
Excellent installation
November 16, 2020
Mannix Heating and Air Conditioning do an excellent job at a fair price. All employees seem happy working for Mannix , everyone is top notch from customer service, keeping you informed, sales working with your needs and budget, and installation. Matt installed my new furnace, looks great and works properly.
Richard
Expertise (5)
Service (5)
Solve Problems (5)
Highly recommend Mannix!
November 02, 2020
Mannix Heating and Cooling, LLC provided great service when we were in need of a replacement heat pump. They are a professional and honest company!
Wayne
Expertise (5)
Service (5)
Solve Problems (5)
Installation of Furnace and A/C Units
October 28, 2020
I had Mannix install a new upstairs A/C unit and furnace in August 2019. At the time I received several bids and Mannix was among the lowest for similar efficiency equipment. They did an excellent job installing the equipment quickly, taking care inside of the house not to damage anything. They explained how to use and maintain my system and answered all of my questions. In the interim, Mannix has come out to perform regular maintenance checks on the new system (and my older system for the lower level) and their service technicians have been very efficient, polite and informative. As a result of my good experience with Mannix, this month I used them to replace the furnace and A/C units for my lower level (main system) and I could not be happier with the result. My experience with these installers was every bit as good as in 2019, and the price of the system was very competitive. I would recommend Mannix to anyone in northern Virginia needing HVAC sales or service.
Joe
Expertise (5)
Service (5)
Solve Problems (5)
Great experience with Mannix Heating & Cooling (Northern VA)
October 26, 2020
No issues at all, they were prompt and clean \- laid down tarps so floors wouldn't get dirty, shoe covers, masks on the entire time.
ANGELA
Expertise (5)
Service (5)
Solve Problems (5)
Excellent work.
October 09, 2020
The installers seem to have done excellent work. They answered my many questions and were helpful with regard to questions associated with that of my steam humidifier and UV light.
MICHAEL
Expertise (5)
Service (5)
Solve Problems (5)
Great service and communication
August 23, 2020
Hal was great, answered all of my questions and provided great advice and service
SAMUEL
Expertise (4)
Service (4)
Solve Problems (4)
Total redo
August 17, 2020
Mannix was super professional and worked with me for a fantastic experience. Very professional and clean.
MIKE
Expertise (5)
Service (5)
Solve Problems (5)
Highly responsive professional service!
August 16, 2020
I have been using Mannix Company for some years. Their service is highly professional, responsive and efficient. I very much appreciate their support and advice.
TIANYANG
Expertise (5)
Service (5)
Solve Problems (5)
Mannix HVAC
August 13, 2020
Service was top notch starting with Hal who did the initial consultation, to the technicians that came to install. All were efficient, neat, professional and personable. Hal and the technicians answered every question adequately and explained process and procedure without any high pressure tactics. We must have received consultation from at least 5\-6 other HVAC companies and Mannix stood out best for us!
JANICE
Expertise (5)
Service (5)
Solve Problems (5)
Fast, professional and capable
August 04, 2020
I cannot tell what the boxes above mean but they get a perfect rating from me
JOAN
Quick, Efficient, and Friendly
July 28, 2020
Very friendly servicers who replaced our compressor and coil unit. They walked me through the process, answered questions, and even went above and beyond when I asked them to correct an error from a previous install (not by Mannix). They allowed me to ask questions at the end of the service, and I didn't feel rushed. I will definitely recommend them to anyone and we look forward to continuing to use Mannix for any of our HVAC needs.
Puhl
Expertise (5)
Service (5)
Solve Problems (5)
Great experience
July 01, 2020
Was an easy installation with expert service
Ann
Expertise (5)
Service (5)
Solve Problems (5)
mannix
June 04, 2020
Used before
Andrew
Expertise (4)
Service (4)
Solve Problems (4)
Easy process
September 13, 2019
Overall a very good process from the beginning to the end and very pleased. Only minor issue is that AC makes a strange buzz noise when first starting up but will see if that works its way out in first few weeks. But if not I'm sure Mannix will take care of it.
Andrew
Expertise (5)
Service (5)
Solve Problems (5)
