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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 616 customer reviews

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!


Map of Alexandria, VA

Jermaine Rocks the House




Amazing work by this tech. He was able to diagnose and resolve a faulty HVAC installation (performed by a competitor company), which had resulted in massively sweaty (condensation-soaked) ducts. He was knowledgeable, highly skilled, efficient...,and a very cool guy. Highly recommended.


Map of Alexandria, VA

Great service from Rony




Rony showed up on time, investigated and diagnosed the problem with my AC unit very quickly. He also fixed it quickly and provided me with tips to keep the drain clean.


Map of Alexandria, VA

Great Service that exceeded my expectations!!




This is by far the best HVAC company I have used. Erwin was professional, knowledgeable and extremely thorough. He did such a great job that I signed up for their maintenance contract to ensure my systems are always operating at their optimum level.


Map of Alexandria, VA

Terrific and Fast Service




Erwin worked diligently on repairing several aspects of our air conditioning system. He was very professional, showing me the damage to our units and explaining how the components work together to efficiently and safely provide AC to our home. I've never had a technician be so thorough and explain what needed to be done in such a comprehensive and easy to understand way. I really appreciated all his hard work and thoroughness especially on a very hot day!


Map of Arlington, VA

Great service, knowledgable and professional technician.




The technician was responsive on a Sunday afternoon. He was very professional and did a great job. Couldn't have asked for better service and experience.


Map of McLean, VA

Great company, Great Service!




Came out the same day to fix broken A/C. Technician called ahead and came to the house at the promised time. Great price and the technician was awesome! Explained exactly what he was doing, showed me the broken part and fixed it in no time.


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
Jermaine A.

Jermaine A.

No AC

Near Jamieson Ave, Alexandria, VA 22314
Jermaine A.

Jermaine A.

No ac

Near N Woodstock St, Arlington, VA 22207
Jermaine A.

Jermaine A.

No Ac

Near 20th St N, Arlington, VA 22207
Jermaine A.

Jermaine A.

No AC

Near Aristotle Dr, Fairfax, VA 22030
Jeremy G.

Jeremy G.

No ac plus repairs

Near Ingleside Ave, McLean, VA 22101
Erwin V.

Erwin V.

Air conditioning repairs

Near N Van Dorn St, Alexandria, VA 22304
Jermaine A.

Jermaine A.

AC Repair

Near N Hampton Dr, Alexandria, VA 22302
Jeremy G.

Jeremy G.

Clearing clogged drain

Near Middle Ruddings Dr, Lorton, VA 22079
Josue R.

Josue R.

Responded to a no A/C call, when arrived found thermostat miswired not energizing the reversing valve, corrected wiring and performed start up and run checks to assure proper sequence of operations.

Near Dead Run Dr, McLean, VA 22101
Robert C.

Robert C.

Performed cooling inspection and cleaned blower assembly on Bryant system

Near Randolph St, Fairfax, VA 22030
Jermaine A.

Jermaine A.

No AC

Near Heatherway Ct, Alexandria, VA 22315
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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.