45714 Oakbrook Ct #180
Sterling, VA 20166
Mon-Fri 7:00am-5:00pm
In business since 2010

Comfenergy, located in Sterling, VA, is a locally-owned and operated energy services company, specializing in insulation, HVAC, and window replacement services to improve the overall comfort, health, and energy efficiency of residential or commercial buildings in Northern Virginia. The "Home Comfort Guys" specialize in fixing uncomfortable homes and businesses and they can help you too!

Hiring the authorized Dr. Energy Saver company in Alexandria and Northern VA means you can benefit from:

  • Energy Audits to Pinpoint Energy and Comfort Issues
  • Exclusive, Proprietary Insulation Products
  • Technicians Continuously Trained at Dr. Energy Saver's State-of-the-Art "Energy City"
  • Direct Contractor Financing Options for Qualified Borrowers
  • Free, No-Obligation Evaluations and Estimates - Contact Today!


  • Insulation added to attics, basements, crawl spaces, and walls to protect homes from cold, heat, and humidity; reduce noise, and provide even in-home temperatures.
  • Air Sealing to seal the gaps in your home that contribute to wasted energy and comfort issues.
  • Window Replacement to replace inefficient single-pane windows or drafty windows.
  • Ductwork Sealing and Insulation to fix leaks, holes, and loose connections in ductwork that can contribute to high energy bills, uneven temperatures, and poor air quality.

Products Installed:

  • Spray Foam Insulation
  • Blown-In Cellulose Insulation
  • Radiant Barrier Insulation
  • SuperAttic™ Rigid Foam Insulation System
  • ProWool™ Soundproofing Insulation
  • Energy-Efficient Replacement Windows & Doors

Service Area:

Comfenergy proudly serves Alexandria City County, Arlington County, Clarke County, Culpeper County, Fairfax County, Fairfax City County, Falls Church City County, Fauquier County, Frederick County, Fredericksburg County, Loudoun County, Manassas City County, Prince Edward County, Prince William County, Rappahannock County, Spotsylvania County, Stafford County, Warren County, Winchester County, as well as Jefferson County, WV. This includes the cities and towns of Sterling, Ashburn, Reston, Great Falls, Herndon, Vienna, Middleburg, Purcellville, Fredericksburg, and surrounding areas.

Check out insulation, window replacement, and HVAC before and after photos and read reviews and testimonials from customers below. Schedule your free evaluation and estimate today!

By Sharon C.
By Daniel A.
By Hisham S.
By Josie D.
Dharma G.
Arlington, VA
Carl was great. Very informative, patient, and willing to provide quotes on different install types.
Comfenergy Before & After
  • Leaky & Poorly Insulated Attic Duct Work in  Boston, VA
    Leaky & Poorly Insulated Attic Duct Work in  Boston, VA

    Leaky & Poorly Insulated Attic Duct Work in Boston, VA

    This Boston, VA homeowner had issues staying warm in the winter and cool in the summer. A FREE comfort evaluation by Comfenergy revealed, among other things, an HVAC ducting system located in the attic that was both leaky and not insulated.  The hot air was leaking into the attic in the winter. The cold air was becoming re-heated in the summer. Not only was this causing discomfort, but it was making their utility bills go literally through the roof!! Comfenergy encapsulated the attic ducting system to seal it from those air leaks. This keeps all of their air in the home!  It also insulates the air travelling through the ducting system so that it comes out of the vents at the right temperature to stay comfortable.
  • Insulating Barn Walls in Boston, VA
    Insulating Barn Walls in Boston, VA

    Insulating Barn Walls in Boston, VA

    Homeowners in Boston, Va have a farm and wanted to insulate the walls in their barn. One of our evaluators, Pedro, determined that closed cell spray foam would do the best job at insulating this space. Closed cell spray foam adheres to all surfaces, expands in place, and air cannot pass through it. It has an R value of 6.3 per inch and with it's ability to stop air flow, it is superior insulation. One inch of closed cell foam sprayed in place is worth many inches of other insulation materials. This is why spray foam is used in most "zero energy" homes. 
  • Crawl Space Encapsulation-Culpeper, VA
    Crawl Space Encapsulation-Culpeper, VA

    Crawl Space Encapsulation-Culpeper, VA

    This Culpeper, VA homeowner was interested in several comfort solutions for their home.  The lower level floors are always cold in the winter, and seemed drafty.  Plus, the house was always humid and clammy. Scott from Comfenergy evaluated the situation and found crawl space encapsulation would be the best solution.
  • Cold Rooms-Rixeyville, VA
    Cold Rooms-Rixeyville, VA

    Cold Rooms-Rixeyville, VA

    This Rixeyville, VA homeowner was complaining about a cold room on the upper level of their home. After a full comfort evaluation provided for FREE by Comfenergy we found an attic that was adjacent to this room. The wall adjacent to this attic was merely insulated with fiberglass batts.  The problem with this is that fiberglass does NOT stop air from travelling around and through it.  This is why your furnace filter is made of fiberglass. It allows the air through, but not the dust and dirt. Comfenergy solved this issue by using 2" thick EPS SilverGlo foam boards to secure on this wall to provide a good air barrier and an additional R10 thermal insulation value. Now this room is toasty warm and can be used in cold winter months!!!
Inc. 5000 List

Inc. 5000 List

Loudoun County Chamber Small Business of the Year Award

Loudoun County Chamber Small Business of the Year Award

Carl Depner

Certified Comfort & Energy Consultant

Corey Hatcher

Certified Comfort & Energy Consultant

Matt Pascual

Certified Comfort & Energy Consultant

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