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HVAC Repair & Installation in Northern Virginia

If you’re a homeowner in Northern Virginia, you’re probably familiar with the term “HVAC.” But other than heating and air conditioning, do you really know anything about your HVAC system?

Heating, Ventilation and Air Conditioning (HVAC) refers to the entire system and range of procedures required for heating and air conditioning in your home or business. Our NATE-certified HVAC contractors are dealers that specialize in the HVAC repair, service and installation of heating and air conditioning equipment which includes heat pumps, central air conditioning and furnaces. Besides equipment our HVAC specializations include the ventilation system and other ancillary products that are attached to the system such as humidifiers, dehumidifiers, air cleaners and other devices.

Need HVAC services in Fairfax or Northern VA? Contact the HVAC experts at HVAC Unlimited! We are awaiting your call with the friendliest customer service representative in the area!

Split HVAC Systems

In a residential setting, you will typically see what is known as split-system HVAC equipment. This means that part of the HVAC system is located indoors, and part of it is located outdoors. The indoor components will consist of an evaporator coil, which is either connected to the furnace or located inside the air handler of your heat pump.

The outdoor component of a heating and air conditioning system is called a condensing unit and is made up of the condensing coil and the compressor. The compressor is the “heart” of the system because it pumps the coolant and lubricating fluid throughout the machinery. It is the hardest-working and most critical part of the system. In commercial applications, we normally install package HVAC systems that contain all components in one outside unit.

Proper HVAC Ventilation

What do you know about your ventilation system? Here are a few facts:

  • Ventilation refers to the duct system that circulates the air in your home or business.
  • Air coming into the indoor system is called return air; air going out of the indoor component to the rest of your house is called supply air. In some cases there is very little on the return side, and it may only consist of an empty space below the HVAC closet or a plenum connected to a hole in the roof.
  • Modern building codes sometimes require returns in every room, so this can become more complex for newer buildings.
  • The ventilation aspect of HVAC is extremely important in terms of comfort, energy efficiency, equipment operation and indoor air quality.
  • There can be hundreds of feet of duct in an average-sized house, and it frequently is placed in areas such as the attic or basement where the air is not clean. If your ductwork is not perfectly sealed, you will not only lose heating and air conditioned air to outside areas but also bring dusty or dirty air into the conditioned air in your house. This wastes a lot of energy as well as creating a potentially unhealthy indoor environment.

If you are worried about your air, you can always install an air cleaner or other indoor air quality products.

Choose HVAC Unlimited for HVAC Services in Fairfax and Northern Virginia!

NATE-certified HVAC contractors must be experts in all phases of heat pump, furnace and air conditioner services. We have years of experience in HVAC repair and installation and are able to handle every aspect of your heating and cooling needs. What are you waiting for? Contact us today to schedule an appointment!

HVAC Unlimited Service Areas

We serve areas throughout Northern Virginia, including Aldie, Alexandria, Annandale, Arlington, Ashburn, Bailey’s, Brambleton, Bristow, Burke, Centreville, Chantilly, Clifton, Fairfax, Fairfax Station, Falls Church, Fort Belvoir, Franconia, Gainesville, Great Falls, Haymarket, Herndon, Leesburg, Lorton, Manassas, Mclean, Mount Vernon, Oak Hill, Oakton, Purcellville, Reston, South Riding, Springfield, Stafford, Sterling, Tysons Corner, Vienna, West Springfield, and Woodbridge.

Contact us online now or give us a call us at 703-493-1200 to schedule a service! 

Local Reviews
for Northern Virginia

Rated 5.0 out of 5 stars based on 577 customer reviews

Map of McLean, VA

HVAC Service Call




Jermaine had a very pleasant demeanor and provided me with requested advice on how a problem unrelated to his service call might be solved. The service call appeared to be handled well. I have not rated the quality of Jermaine's work only because I do not consider myself sufficiently knowledgeable about the what's required in serving a wine cellar air conditioner to make a judgement on this point.


Map of Alexandria, VA

Great Professional Service




Germaine called ahead. He arrived in the appointed time slot. He was very knowledgeable and efficient. He protected the floors and surrounding areas. He did a great job.


Map of Alexandria, VA

Great service by Jermaine, prompt and provides details of all that is done.




Refer to above, Jermaine is very informative.


Map of Arlington, VA

HVAC is a good choice for Customer Service!




HVAC is a professional reliable company with personable technicians. I recommend them.


Map of Arlington, VA

Prompt arrival, extremely helpful - went the extra mile!




Rony arrived promptly and worked diligently. He was helpful in answering the questions I had and was very informative. Also, he improved the set-up of my HVAC unit and helped the closet door close better. 5 stars!!


Map of Alexandria, VA

Great Service !!




Technician was very friendly and knowledgeable.


Map of Alexandria, VA

Great service.




Jermaine was very professional and helpful, answering all of my questions.


Map of Alexandria, VA

A neat freak with a dirty AC unit!




I have a Sanyo unit that needed cleaning and it is located in a cream colored room with cream carpet and furniture. Jeremy, the HVAC tech, was on time, courteous and neat. I am very happy with the service and will continue to use HVAC for all of my AC needs.


Map of Alexandria, VA

efficient and very informative sevice





Map of Alexandria, VA

Well Qualified Technicians




Jermaine, the technician who performed our inspection, was very professional and very competent. He explained what he did and the results. He made recommendations for the fall to prevent any problems and to improve efficiency. We felt very comfortable with him in our home.


Rony T.

Rony T.

Ac not cooling and annual maintenance

Near Agnes St, Lorton, VA 22079
Rony T.

Rony T.

Air conditioning not cooling and annual maintenance

Near Almeda Ct, Lorton, VA 22079
Jermaine A.

Jermaine A.

Cooling Inspection

Near Mt Vernon Trail, Alexandria, VA 22314
Jermaine A.

Jermaine A.

Cooling Inspection

Near Mt Vernon Trail, Alexandria, VA 22314
Jermaine A.

Jermaine A.

Cooling Inspection

Near Donovan Dr, Alexandria, VA 22304
Erwin V.

Erwin V.

Cooling inspection

Near Washington Blvd, Arlington, VA 22201
Rony T.

Rony T.

Ac annual maintenance

Near 15th St N, Arlington, VA 22201
Jermaine A.

Jermaine A.

Cooling Inspection

Near Clayton Ln, Alexandria, VA 22304
Erwin V.

Erwin V.

Cleaning evaporator A coil air handler and replaced insulation rooftop unit.

Near VA-237, Arlington, VA 22201
Rony T.

Rony T.

Ac yearly maintenance

Near Minda Ct, Alexandria, VA 22304
Jermaine A.

Jermaine A.

Cooling Inspection

Near Mt Vernon Trail, Alexandria, VA 22314
Jermaine A.

Jermaine A.

Cooling Inspection

Near Mt Vernon Trail, Alexandria, VA 22314
Jermaine A.

Jermaine A.

Heat Pump Repairs

Near VA-236, Alexandria, VA 22314
Jeremy G.

Jeremy G.

Cleaning up a ductless mini split and testing operation

Near Wolfe St, Alexandria, VA 22314
Jermaine A.

Jermaine A.

Installed EZ Trap

Near Courthouse Square, Alexandria, VA 22314
Jermaine A.

Jermaine A.

Cooling Inspection for Wine Cellar

Near Brook Valley Ln, McLean, VA 22102
Jermaine A.

Jermaine A.

Cooling Inspection

Near Brenman Park Dr, Alexandria, VA 22304
Jermaine A.

Jermaine A.

Cooling Inspection

Near Westgrove Blvd, Alexandria, VA 22307
Jermaine A.

Jermaine A.

Noise heard from Furnace

Near Furey Rd, Lorton, VA 22079
Jermaine A.

Jermaine A.

AC INSPECTION

Near Merrilee Dr, Fairfax, VA 22031
Jermaine A.

Jermaine A.

Cooling Inspection

Near N Randolph St, Arlington, VA 22201
Rony T.

Rony T.

Air conditioning yearly maintenance

Near Larpin Ln, Alexandria, VA 22310
Jermaine A.

Jermaine A.

Cooling Inspection

Near Lee Hwy, Arlington, VA 22201
Jermaine A.

Jermaine A.

AC Inspection

Near N Pitt St, Alexandria, VA 22314
Jermaine A.

Jermaine A.

Clean Blower Motor, Install EZ Trap and Air Knight Air Purifier

Near Englehardt Ln, Alexandria, VA 22314
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