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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 622 customer reviews

Map of Fairfax, VA

Outstanding Professional Service




Robert Campbell, from HVAC unlimited, has been servicing my house hvac systems and our family systems for many years. Robert's hvac services are always very professional and thorough. When any repairs are needed, we feel comfortable about his honest suggestions and prices. We have recommended HVAC UNLIMITED to our family and friends and Robert Campbell is an asset to his company!


Map of McLean, VA

Informative Technician





Map of McLean, VA

Great service




On time, polite and thorough inspection


Map of Falls Church, VA

Great service




Jermaine came to service our HVAC systems today and was professional and knowledgeable. He took the time to explain things to me, which I appreciated. On top of that, he was a friendly and cheerful person. Good job!


Map of Lorton, VA

Great service delivered ahead of schedule




Fast service. Convenient and flexible.


Map of Alexandria, VA

Great service





Map of Fairfax, VA

Great Service when all the other technicians I called seemed lost!




Jermaine was super knowledgeable of my building and was able to identify and repair the problem with my air conditioner in a very quick timeframe!


Map of Arlington, VA

Wonderful experience.




Robert was very thorough and patient. He was respectful and represented HVAC Unlimited very professionally. I enjoyed his supportive, helpful nature.


Map of Lorton, VA

Great Service




On time. Knowledgeable. Professional.


Map of Arlington, VA

Extremely Knowledgeable, Very Service




Jermaine was very quick to get us a solution to what was wrong with our system and immediately fix the problem on site. He was very knowledgable and had great customer service!


Erwin V.

Erwin V.

Heating inspection.

Near McLean, VA 22102
Robert C.

Robert C.

Performed heating inspection on Carrier gas furnace system under contract

Near Covington St, Fairfax, VA 22031
Erwin V.

Erwin V.

Service repairs,no heating.

Near Aspenpark Rd, Lorton, VA 22079
Jermaine A.

Jermaine A.

Heat Inspection

Near Mayhurst Blvd, McLean, VA 22102
Jeremy G.

Jeremy G.

Heating inspection

Near Catbird Cir, Lorton, VA 22079
Jeremy G.

Jeremy G.

Heating inspection

Near Catbird Cir, Lorton, VA 22079
Jermaine A.

Jermaine A.

Heating Inspection

Near Falstaff Rd, McLean, VA 22102
Jermaine A.

Jermaine A.

Heating Inspection

Near Grove Ave, Falls Church, VA 22046
Jeremy G.

Jeremy G.

No ac plus repairs

Near Catskill Rd, Lorton, VA 22079
Jermaine A.

Jermaine A.

Heating Inspection

Near Towne Manor Ct, Alexandria, VA 22309
Jermaine A.

Jermaine A.

Chemically Clean Heat Pump Coil

Near N French St, Alexandria, VA 22304
Jermaine A.

Jermaine A.

No AC

Near Merrilee Dr, Fairfax, VA 22031
Jermaine A.

Jermaine A.

Erik M

Near Merrilee Dr, Fairfax, VA 22031
Jermaine A.

Jermaine A.

Heating Inspection

Near Island Creek Ct, Alexandria, VA 22315
Robert C.

Robert C.

Performed heating inspection on boiler system

Near 24th Rd N, Arlington, VA 22205
Andre M.

Andre M.

Performed cooling inspection on trane ac system

Near Anita Dr, Lorton, VA 22079
Josue R.

Josue R.

Responded to a no A/C call, when arrived found auxiliary drain pan full of water and float switch open. Vacuumed out drain pan and performed run checks, found system low on refrigerant Charged unit to manufacturer’s specs. Added 2lbs of R22. Equipment working properly at this time

Near Merrilee Dr, Fairfax, VA 22031
Jermaine A.

Jermaine A.

No ac

Near N Hampton Dr, Alexandria, VA 22302
Jermaine A.

Jermaine A.

No AC

Near 3rd St S, Arlington, VA 22204
Jermaine A.

Jermaine A.

Sweaty Air Ducts

Near Governors Pond Cir, Alexandria, VA 22310
Rony T.

Rony T.

No air conditioning found clogged drain line.

Near Midtown Ave, Alexandria, VA 22303
Erwin V.

Erwin V.

Water leaking.

Near Elba Rd, Alexandria, VA 22306
Erwin V.

Erwin V.

No a/c

Near Prince St, Alexandria, VA 22314
Erwin V.

Erwin V.

No A/C

Near N Randolph St, Arlington, VA 22201
Erwin V.

Erwin V.

Repairs air conditioning system

Near Cannon Ln, Alexandria, VA 22303
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  • For emergency service, please call our office at 703-493-1200.

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EMERGENCY SERVICE

We have staff on call 24/7 to provide assistance to our customers. We provide emergency service up to 8pm for all customers and 24/7 for contract customers. For quick, efficient emergency services, please call (703) 493-1200 immediately.