4.57 |23 Verified Ratings
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4.57 | 23 Verified Ratings
Write a Review


45714 Oak Brook Ct.
Sterling, VA 20166
Your use of our services is governed by our Terms & Conditions


Comfenergy is a locally owned and operated comfort and energy home performance company. We specialize in residential and commercial solutions designed to improve the overall comfort, health and energy efficiency of the home or office. As a full-service home insulation contractor we start off by conducting a comprehensive home comfort and energy evaluation to identify and locate all the energy losses and weaknesses throughout your building. After the testing is complete we are able to put together a prioritized list of the most cost-effective solutions to correct comfort and energy wasting issues. From there we leave the decision making entirely up to you, letting you pick which home improvements you would like applied to your home. Our main goal is to focus on the most important needs of your building?. Why insulate the garage walls if all of your conditioned air is being lost to the attic? Give us a call today for a free, fast, and friendly quote.


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Service Area

  • Arlington
  • Alexandria
  • Herndon
  • Fairfax
  • Springfield
  • McLean
  • Reston
  • Vienna
  • Falls Church
  • Merrifield
  • Dulles
  • Sterling
  • Manassas
  • Ashburn
  • Leesburg
  • Chantilly
  • Centreville
  • Purcellville
  • Oakton
  • Haymarket
  • Hamilton
  • Middleburg
  • Gainesville
  • Burke
  • Paeonian Springs
  • Aldie
  • Clifton
  • Lincoln
  • Broad Run
  • Annandale
  • Bristow
  • Great Falls
  • Fairfax Station
  • Dunn Loring
  • Greenway
  • Waterford
  • Catharpin
  • Philomont
  • See All >

Services Offered

Home Inspection
  • Home Energy Audit
  • Blown-in Insulation Install
  • Spray Foam Insulation Install

Areas of Expertise

  • Insulation
  • Comfort and Energy Evaluations
  • Basement Waterproofing and Mold Remediation
  • Window Replacements
  • Crawl Space Encapsulation

Product Brands Used

  • Dr. Energy Saver, Basement Systems, Dow, Applegate, Lapolla, Gaco Western

Quick Facts

Business Hours
8:00 AM to 5:00 PM
8:00 AM to 5:00 PM
8:00 AM to 5:00 PM
8:00 AM to 5:00 PM
8:00 AM to 5:00 PM
(Please call to confirm)
  • Small Jobs Welcome
  • Warranty Offered
  • Free Estimates
  • Materials
  • Credit Cards Accepted
  • Warranty Description: 1 year workmanship


In Business Since: 2013
Memberships & Affiliations
  • Loudoun County Chamber of Commerce, BNI, Rotary International, Better Business Bureau
State Licensing
Trade: Residential Builder (RBC)
License #: 2705151837
Expiration: 09-30-2023
Trade: Class A Contractor
License #: 2705151837
Expiration: 09-30-2023
Trade: Commercial Building (CBC)
License #: 2705151837
Expiration: 09-30-2023
  • Loudoun County Service Business of the Year (2018 Winner)
  • 2019 Best Picks (Best Insulation Company)
  • Loudoun Chamber Green Business Challenge
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Business Overview

Community Involvement

Loudoun Chamber of Commerece


Better Business Bureau

Rotary International

Many other non-profits

How We Got Started

I chose to work in this industry because I enjoy problem solving. I enjoy helping people solve all of those issues in their home they never knew they could have solved. Things like hot/cold spots, draftiness, cold floors, high/low humidity, mold/mildew issues, high energy bills, and much more......You name it, and we can solve it..

We started in this industry in 2010.

We describe our business as Up and coming

What makes you different than the competition?

We emphasize diagnosis of issues in the home before prescribing the solution.



My Work
3 Projects
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Ratings & Reviews

Real feedback from real homeowners.
Learn more about this pro by reading the ratings and reviews below.
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Showing 1-10 of 23
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4.0   |  
Review by in Culpeper, VA
From initial contact with their sales department we've had a great experience, Corey did an excellent job of taking pictures and showing the problems in our attic. Their level of communication from emails to phone calls was precisely correct by contacting me when needed and not too much with pictures detailing each solution and its associated cost. On the first work day their crew called ahead of time, arrived promptly and came prepared with masks, plastic sheeting, full body outfits and cloth covering for the stairs. In just over 6 hours they had cleaned up the entire attic removing bad sub-floor and other insulation, laid out the foundation for building a large deck space and placed part of the first layer of materials down. They also sealed the attic door along with some of the air vents and ceiling fans. They completed insulating my front porch overhang and cleaned up all of their mess very well. Painters tape was used on corners where they weâ re most likely to bump into it for protection and plastic sheeting was setup precisely where needed to keep dust off of our hallway things next to the attic entrance. Overall it was a great first day and they even spotted an issue from a previous vendor who failed to properly connect some of their duct work together (which was the original cause of my daughterâ s room temperature being so hard to control the temperature and not easy to spot). The only complaint I have is that while I fully expected the need to finish our attic sub-floor, remaining layers of TruSoftTM Cellulose on the main floor and encapsulate the duct lines with Polyurethane Spray Foam all before finishing with blown-in insulation, they left a key piece incomplete. When leaving they left the duct work leading from our main trunk line to my daughterâ s room off. This left a hole in the main trunk line reducing heat in all upstairs rooms but most important is that nothing was connected to my daughterâ s room. So around 6:00am she woke up coughing as we noticed the upstairs was around 56 degrees. Overall a simple heads up would have solved everything as we have space heaters, however I did not look into the attic when they left so thatâ s my fault for not knowing a key piece of the duct line was missing. Based on the overall work complete I would still very much recommend them as Robert (onsite team lead) was very good at communicating and the crew weâ re all quite friendly. Their work will last for the lifetime of my house and has already added value to the sale price. In the end they made a really nice attic deck leaving me with plenty of useable storage space. While this is not the cheapest company, the quality and knowledge that I never need to worry about my attic again is certainly worth it.
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5.0   |  
Review by in Alexandria, VA
Professional, timely and experts at home comfort remediations. Ben was a pleasure to work with and quickly became a trusted advisor. The install was under a pork and deck and they did a superb job. The porch is so much more comfortable on these 46 degree mornings. Highly recommend them - you will thank yourself every morning
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4.0   |  
Review by in Alexandria, VA
Summary: The Comfy team did a great job b/c they know what they are doing however, they are not without faults. Work Completed: Full crawlspace escalation and turning a vented attic into an unvented attic by adding CC spray from on the roof deck. Time frame: July 13-17 2020 Results: We are only a month out from the work being completed, so the analysis is on-going but here are the numbers so far. My Aug electricity bill was down 26% in real dollars from July. That reduction is in spite of the fact that Aug had a 31% higher average Cooling Degree Days (base Temp 70F - In addition, the first week of my Aug billing cycle included this work. Again, this is very early on but that is a promising start. Other benefits include less variability in house temperature. Before I would see a temperature difference of 5 degrees Fahrenheit between my bottom and top floors. Now they are no more than 1.5 degrees apart (the thermostat is on the lowest level). This creates an overall more pleasant living environment. So while Iâ m looking at a return on investment that stretches out past 10 years, during that time itâ ll be a more comfortable home to live in. Challenges: My only complaint is that there doesnâ t seem to be a solid quality control program. To be fair, I have high standards of work quality. Especially when Iâ m paying for it. Comfy clearly understands the science and best practices. Itâ s always a challenge translating that over to the real world, which is messy. With that said I felt like I was the one that had to be pointing out the areas of poor workmanship. It sure would have been nice to feel like that quality control was being done for me. Now for the good news, Comfy is correcting all the issues I have pointed out (scheduled but not all completed). Bottom Line: Comfy has a talented team of people, who know the work. They will do a good job at a fair price. But donâ t let the sleek marketing and science lull you into a false sense of security, make sure you get what you paid for.
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4.0   |  
Review by in Falls Church, VA
Quick and easy.
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4.5   |  
Review by in Leesburg, VA
Definitely made a difference in my attic!
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4.5   |  
Review by in Alexandria, VA
The process was explained in great detail which helped me understand what was recommended to have done and why. The Comfenergy contractors that came onsite were super friendly and respectful. They did a great job and showed me the work that they did. The only issue I had was that they didn't know what to charge me after the work was done. I had to look up what I had put down on the deposit, then let them know the balance. The next company to come out was Atlantic Duct Cleaning for the duct cleaning and the Aeroseal duct sealing. Again, the contractors were friendly and thorough. They showed me before and after pictures of the ducts, and I got a report of the Aeroseal results from before to after. I can feel the difference in the warmth of the home. I would recommend both companies.
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5.0   |  
Review by in Arlington, VA
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5.0   |  
Review by in Arlington, VA
Not inexpensive, but worth the cost for energy savings and efficiency. We had received a much higher bid from another company, and were glad we chose Comfenergy. The technician was very knowledgeable and we felt a great difference in our upstair master bed and bath which were uncomfortably warm prior to the improvements. Also nice now to have "green" home for resale.
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4.0   |  
Review by in Aldie, VA
Overnight winter temperatures was about 10 degrees F. The crew came that morning prepared for the cold weather. They worked hard all day and cleaned up after the work was done. The site was cleaner when they left than it was when they arrived. They were very professional.
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4.0   |  
Great sales people and technicians.
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Showing 1-10 of 23
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