HVAC Services

Mannix Heating and Cooling is a full service HVAC contractor with the experience, training and knowledge to address every phase of furnace & AC installation, repair & maintenance.

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To keep the electrical systems in your home or office safe and reliable always use a licensed and bonded professional electrician.

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Maintenance Plans

Routine HVAC maintenance can help improve indoor comfort, lower energy costs and extend the life of your heating & air conditioning equipment.

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Air Conditioning, Heating, and Electrical Contractor Serving Washington, DC and Surrounding Communities


The weather in the Mid-Atlantic region changes quickly and can be severe. Homeowners rely on their HVAC equipment to keep the indoor environment healthy, comfortable and energy efficient. At Mannix Heating and Cooling, our commitment to customer service is evident in our extensive training, experience and deep understanding of air distribution science.

When a unit breaks down, it is important to choose a contractor who understands the complexities of the heating process and refrigeration cycle. We are trained to service every major brand of equipment, and our technicians will ensure that your system is optimized for peak performance and maximum comfort.

Total HVAC Services

An air conditioner that fails during high heat and humidity can be frustrating and expensive, especially for homes with senior citizens and small children. To help keep your HVAC equipment performing efficiently, we provide several vital services:

  • Air Conditioning & Heating Installation: Every successful AC installation starts with an accurate design. Our engineers run a complete set of load calculations that involve the unique energy consumption characteristics of your home or office. This includes windows, doors, insulation, perimeter tightness and duct leakage.
  • Air Conditioning & Heating Repair: When a unit malfunctions during extreme weather, it can be costly and disruptive. Time is of the essence, and your contractor should have the resources to accurately diagnose the problem and quickly repair your equipment. Our factory trained and NATE certified technicians are here to answer your calls 24 hours a day, and we always respond to every service inquiry in a timely manner.
  • Electrical Services: Electric projects are often complex with safety issues a top concern. The professional electrical services that we provide are comprehensive and include small to whole-house electric system upgrades, installations of standby generators, surge arrestors, ceiling fans, lighting fixtures, plus network and telephone cabling.
  • Indoor Air Quality: Polluted indoor air can affect the health of a home’s occupants and also negatively impact equipment performance. We can develop a comprehensive IAQ strategy that includes filtration, ventilation and humidification to help keep your home clean and smelling fresh.
  • Maintenance Service: Preventive maintenance will help reduce operating costs and extend the life of your equipment. Our technicians will visit your home on a periodic basis and perform a variety of important services that will locate minor problems before they can affect system performance.
  • Water Heater Installation: Heated water is one of life’s most important necessities. We offer a variety of water heater solutions including conventional electric, gas and tankless units.

Customer Testimonials

I can’t say enough good things about this company and all of the individuals who work for them… you guys have won me over, and when I need other A/C or furnace work done, or if I need to replace anything, you guys get the business, period!

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One Source for HVAC

Air Conditioning service problems can be frustrating and very costly. We invite you to explore our complete array of HVAC services that can help improve comfort, enhance efficiency and create a healthy indoor environment.

Mannix Heating and Cooling provides two separate locations to serve the local community. We have offices in Chantilly and Germantown, and we service the surrounding areas including Ashburn, VA; Bethesda, MD; Chantilly, VA; Fairfax, VA; Germantown, MD; Leesburg, VA; Potomac, MD; Reston, VA; Rockville, MD; and South Riding, VA.