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Commercial HVAC Services Fairfax, VA

Your employees need a cool, comfortable workplace to stay productive throughout the year, and you need great HVAC systems to keep your office that way. At HVAC Unlimited, we’re known for striving for excellence in everything we do, and that includes our comprehensive commercial heating and cooling services. From HVAC replacement and installation to maintenance and repair, we have all the great services your business needs to maximize productivity and minimize costs.

Commercial HVAC Replacement and Installation

When you need a new commercial heating and cooling system for your business, choose us. Our technicians will help you select the best system for your space. Plus, they are certified and trained to install every unit to the manufacturer’s expectations, which ensures optimal efficiency and lower operating costs for you. We’re proud to offer a broad selection of Carrier heating, cooling and air quality systems to our commercial customers, including:

  • Air conditioners
  • Heat pumps
  • Boilers and furnaces
  • Geothermal heat pumps
  • Air purifiers, ventilators and other indoor air quality systems
  • Packaged products
  • Thermostats and control systems
  • Cooling towers
  • Chillers
  • Water source heat pumps
  • VAV Boxes
  • IT rooms
  • Liebert systems

Because every office’s heating and cooling needs are unique, we start every installation project to assess those needs. Our expert technicians will work with you to find the right climate control solution for your business, then work diligently to install it up to the manufacturer’s specifications.

Commercial HVAC Maintenance and Repair

Any successful business depends on efficient operations, and we’re here to help you run your company more efficiently with improved heating and cooling. We offer affordable annual service agreements to check on your essential commercial heating and cooling systems and clear up any emerging issues. Moreover, we’ll make the small calibration adjustments needed to minimize energy usage without sacrificing cooling power. In short, annual service from HVAC Unlimited will save you money now on your utility bills and even more later on repairs and replacement.

Of course, even well-maintained systems occasionally have issues, and we know your business can’t afford to wait. That’s why we offer 24-hour emergency repair services; whenever there’s a problem, our expert technicians will be there quickly. We’re fully qualified to repair all major makes and models of HVAC systems, and we complete most repair jobs in a single visit.

Our Credentials

At HVAC Unlimited, we know our colleagues in the business community can only afford to do business with companies they trust. We are a class A licensed, bonded and insured corporation, and we hold a Mechanical Master License in the Commonwealth of Virginia. Our founder and Vice President, John and Jack Cunningham, have a combined 60 years’ experience at every level in the HVAC industry. We bring our vast expertise and commitment to excellent service to every installation, service and repair job, and we’re proud to provide the top-quality service that our commercial customers have come to trust.

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 and repairs

Near Leesburg Pike, Falls Church, VA 22041
William C.

William C.

Performed 2 contracted heating inspections on hydronic heat pumps.

Near Prosperity Ave, Fairfax, VA 22031
William C.

William C.

Heating inspection on Hydronic Airhandler.

Near Spring Gate Dr, McLean, VA 22102
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
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  • For emergency service, please call our office at 703-493-1200.

24/7 SERVICE
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.