About Us

John LeVan, Owner

John LeVan, Owner

Comfenergy, in Sterling, Virginia, prides itself in "creating a comfortable, energy-efficient, healthy home, and work environments by providing value through people, products, and processes". In over ten years of existence, 22 awards were given including, the 2020 #1 Dealer in the Network Award. This locally owned business offers insulation services, soundproofing, basement & crawl space services, home energy audit, and windows & doors inserts.


Services Provided

  • +Doors

    • Aluminum Door Installation & Replacement
    • Cellar Door Installation & Replacement
    • Diamond Plate Door Installation & Replacement
    • Door Glass Installation & Replacement
    • Door Repair
    • Door Screen Installation & Replacement
    • French Door Installation & Replacement
    • Front Entry Door Installation & Replacement
    • Hardware, Latches & Track Installation & Replacement
    • Man Door Installation & Replacement
    • Patio Door Installation & Replacement
    • Screen Door Installation & Replacement
    • Sliding Door Installation & Replacement
    • Steel Door Installation & Replacement
    • Storm Door Installation & Replacement
    • Vinyl Door Installation & Replacement
    • Wood Door Installation & Replacement
  • +Energy Audit

    • Blower Door Testing
    • Home Energy Audit
  • +Heating & Air Conditioning

    • Duct & Ductwork Installation
    • Duct Insulation & Sealing
    • Duct Repair
  • +Insulation

    • Air Sealing Services
    • Attic Hatch Insulation Installation & Replacement
    • Blown-In Insulation Installation & Replacement
    • Cellulose Insulation Installation & Replacement
    • Crawl Space Insulation Installation & Replacement
    • Fiberglass Insulation Installation & Replacement
    • Floor Insulation Installation & Replacement
    • Foam Board Insulation Installation & Replacement
    • Garage Insulation Installation & Replacement
    • Injection Foam Insulation Installation & Replacement
    • Mineral Wool Insulation Installation & Replacement
    • Roof Insulation Installation & Replacement
    • Spray Foam Insulation Installation & Replacement
    • Wall Insulation Installation & Replacement
  • +Radon Testing & Mitigation

    • Radon Mitigation
  • +Remodeling

    • Basement Flooring
  • +Sump Pump

    • Sump Pump Installation & Replacement
    • Sump Pump Repair & Service
  • +Windows

    • Aluminum Window Installation & Replacement
    • Bay Window Installation & Replacement
    • Bow Window Installation & Replacement
    • Casement Window Installation & Replacement
    • Double-Hung Window Installation & Replacement
    • Exterior Shutter Installation & Replacement
    • Fiberglass Window Installation & Replacement
    • Picture Window Installation & Replacement
    • Security & Storm Shutter Installation & Replacement
    • Sliding Window Installation & Replacement
    • Storm Window Installation & Replacement
    • Vinyl Window Installation & Replacement
    • Window Cleaning
    • Window Glass Installation & Replacement
    • Window Repair
    • Window Screen Installation & Replacement
    • Wood Window Installation & Replacement

Company Highlights

  • In business since 2013
By Daniel
e did an excellent job in pointing out the areas that need attention.
By Wendall
Everyone connected to the company is very professional- Excellent work! 
By Ryan
This was a great appointment. The tech was very informative.
By Virginia
my windows leaked.
By Paul
Justin, Anthony, Ariel Robert Ulises, Irban and all who worked this crawlspace encapsulation were personable and professional. Special mention is made of Justin. A herd working, bright young man. Ariel and Anthony provided immediate response and corrected a post instal problem. Terrific customer service!
By Scotty
The best part about the experience for me? As soon as Mike Dowling arrived, I told him exactly what I wanted and wasn't interested in anything other than spray foam insulation in my attic, and from then on until the time he left, we discussed nothing more than what I wanted. Not once did he try to up-sell me on other services that I didn't want or need. I appreciated that more than anything else. He was very polite, professional, and he really knew his product. If I need to call Comfenergy for any other services in the future, I will be asking for Mike by name.
By Debra
Looking forward to hearing from your organization to begin work.
By Tammy
The only thing I wasnt sure of is when they finished no one called to confirm that they were actually done. I was absolutely pleased with everyone and everything. I can already tell a difference in the comfort of my home. Thank you!
By John Barrett
on time and got right to work. Communicated well on what they were doing.
By Rich
Appreciate the professionalism
By Natalie
The job was thoroughly completed with more done at a lower cost. 
By Randall
Responsiveness, thorough explanation of recommended solution. Really worked w/ us to find the optimal solution that fit my needs.
By Joe
Your team did a good job sealing up the house. They put a hole in my ceiling from the attic, but fixed it. They blew insulation all over my baby's room including crib and clothes, but vacuumed it. They fixed all their sloppy mistakes.
By Stephanie
Very pleased with overall process, crews etc. Thank you for helping make my house more comfortable and energy efficient!
By Jade
Overall, very pleased. Would use again and recommend to others.
By Jacque
I was kept informed by email and I even had to change one of the days and it was easily worked out for me. I can't say enough about how pleased I am with the work and the courtesy from the crew and office staff
By Pam
Your men were excellent! They were very informative, a pleasure to work with, and finished faster than I thought they would. 
By Dana
The evaluation was very informative, and I learned a lot.
By Norma
The heat intensity in the kitchen area. The 107 degrees coming from our master window. Surprising to say the least.
By Robert & Patricia
Cyrus came to quiet a fan that had been recently installed. My wife and I were both very impressed with his problem-solving ability. As he determined, the noise had nothing to do with the fan. He also removed some water from an outside vent which he thought, and correctly so, was causing the noise. He reattached the wallboard to the ceiling when he had finished. The problem has been solved and the fan is quiet again. Further, Mr. Toby demonstrated excellent interpersonal skills. He was able to explain, in terms we could understand, what he was doing and gave us some choices for solutions along the way. We will recommend your company to others and certainly come to you first, if we should need your expertise again. 
Brooks N.
Mauretown, VA
They took the time to educate us about how to best prioritize our focus to get the greatest bang for our buck.  The materials sent in the introductory package were extremely informative.  The crew was wonderful, courteous, professional, and exemplary all around. 
Tara L.
Cross Junction, VA
Shayne Sandner was extremely professional, polite, thorough, and explained everything that he did so that I could understand it and even followed up with pictures of the work completed.  He spent a lot of time at our house showing us where we were losing energy.   The crew was very polite and respectful, hard-working, and completely thorough and even completely cleaned the area when finished.
Elizabeth K.
Stephens City, VA
Izzy not only got the job done (with the assistance of his crew) but he explained the process and physically showed me the problems when he was able to identify them.  
Joseph D.
Stephens City, VA
Comfenergy did an excellent job from their sales personnel to the installers. The installers were very courteous and considerate. The installation took four days and they worked very hard. They listen to everything I had concerns about and corrected any issues that I may have had. In addition, they cleaned up after themselves and put everything back in place. I couldn’t have asked for a better team.
Dave S.
Front Royal, VA
You were thorough and responsive.  Many companies don't call back.
Philip S.
Bunker Hill, WV
Good Afternoon Everyone   Brent Bevens and Carlos Ramirez did the insulation of our Fireplace today.  Yippee!!!! Their friendly Customer Service coupled with their hard work certainly was appreciated.  They came around 9:00 and completed the task at 3:30.   Before starting they shared pictures to let us know exactly what they were told to do.  They worked fantastic as a team to ensure the job was done properly.  They ensured the trash was picked up and put in garbage bags while they were working.  They walked the yard to ensure everything that was blown by the wind was picked up.  HOA cannot complain one bit.  We look forward to receiving a telephone call from Brenda to schedule the blow in insulation for the bottom flooring.  The inside floor gets extremely cold during the Winter.  We truly appreciated the excellent Customer Service and enjoyed having Brent and Carlos taking care of the job.  We took pictures of the work and can be assured the air won't be coming in anymore.  Hopefully, our heating bill will decrease.  Thanks to Comfenergy our home is much more insulated and our utility bills sure have decreased. 
Tony J.
White Post, VA
Very professional and personable.  Very accommodating of our needs and concerns.
Andrea S.
Boyce, VA
Salesperson took time to explain reasons/science behind the work.  Crew was excellent.  Very professional and hard working.
Marlene H.
Summit Point, WV
The crew came on time, were professional, they kept me informed throughout the process, and cleaned up afterwards.  
Travis H.
Berryville, VA
Mike was thorough in his explanation of our energy needs and provided the options very clearly.  Crew was courteous, efficient, and explained every step of the process.  Very satisfied.
Tom C.
Ranson, WV
Courteous and friendly.  Explained everything very well and gave options for installation.  They were great!
Robert M.
Charles Town, WV
Crew was very friendly and explained exactly what work they would be doing and set good expectations.
Ken L.
Bluemont, VA
Nice attention to detail.  Good listeners and answered all my questions. Salesperson gave a pretty thorough overview of areas to address
Eric A.
Delaplane, VA
Very thorough evaluation and recommendations.  The crew was very careful, courteous, and professional.  Took a lot of pride in their work.  
Mike D.
Harpers Ferry, WV
The company knew we needed to get the job completed quickly due to renovation plans and were willing to schedule weekend jobs in order to accomodate our work schedules.  Mike was thorough in explaining what would be done and made sure I was shown the work as each step was completed.  
Rimas G.
Marshall, VA
All three members of the crew were professional, knowledgeable, and friendly.  I will absolutely recommend Comfenergy.  Very happy to do business with you -- keep this crew happy.  They're gold!!!!
Dan C.
Round Hill, VA
The crew was very considerate and pleasant to have around.
Jamie B.
Purcellville, VA
"I had a fantastic experience with Comfenergy and would recommend them to anyone who needs insulation and attic sealing work. Our Consultant Carl was informative, thorough, and made suggestions based on what I wanted to improve with some hot and cold spots in our house, as well as provided reasonable ROI estimates to help me determine which fixes were appropriate. He did not try to pressure me into a sale, and even did a few minor tweaks to our HVAC settings during the consultation that had an immediate positive effect.Team Lead Robert and the rest of the installation crew were efficient, professional, and the quality of the work was stellar. This was one of the least disruptive home projects I've had done and after they cleaned up there was zero debris or dust in their work area.I did have one question about our final invoice, and when calling the office I had the pleasure of speaking with Christine. She was extremely polite and helped me out right away.Very well run company and I look forward to seeing the attic improvements pay off! We can already feel the house is more evenly conditioned and expect to see noticeably lower energy costs."
James S.
Purcellville, VA
"The inspection of our house done by Carl was very thorough. Installation of hard foam (Silver Glo) air barrier in certain parts of our house was very fast and well done. The crew cleaned up afterwards. I was very pleased with the work done by Comfenergy. The results are a more energy efficient house."
Leah T.
Culpepper, VA
"We were so impressed with Melvin and his team. They did excellent work and were very conscientious about the details. I would recommend them to anyone looking to do efficiency upgrades!"
  • Basement Spray Foam-Cross Junction, VA - Before Photo
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    Basement Spray Foam-Cross Junction, VA - After Photo
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    Basement Spray Foam-Cross Junction, VA

    This Cross Junction, VA homeowner was looking for the most comfortable, most efficient way to insulate their basement when remodeling.  Comfenergy suggested the perfect solution with closed cell spray foam insulation. This completely air seals and insulates at the same time for the best results you can get!

  • Attic Insulation Project in Winchester, VA - Before Photo
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    Attic Insulation Project in Winchester, VA - After Photo
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    Attic Insulation Project in Winchester, VA

    A home in Winchester, VA was experiencing unbearably hot top floors during the summer months. The master bedroom was the worst - sometimes, the homeowners had to sleep in the downstairs guest bedroom to escape the heat! 

    It came as no surprise to us that the attic had insufficient and almost non-existent insulation. It also had a vent that was directly allowing outside air in! It's no wonder that the rooms under this attic would be having these issues. 

    To fix this problem, we first air sealed leakage points with spray foam. We then blew in a thick layer of cellulose insulation through the entire attic. This attic is now a conditioned space and won't contribute to comfort/efficiency problems any more! 

  • Injection Foam in Uninsulated Walls - Before Photo
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    Injection Foam in Uninsulated Walls - After Photo
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    Injection Foam in Uninsulated Walls

    Deep retrofit project in Winchester Va.  Removed the siding, used Injection Foam to insulate a 100 year old farm house.   Really great proect for Really Great Customers

  • Can light leakage-Middletown, VA - Before Photo
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    Can light leakage-Middletown, VA - After Photo
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    Can light leakage-Middletown, VA

    This Middletown, VA homeonwer was complaining that their top floor was cold and drafty in the winter. Upon a full comfort and energy evaluation by Comfenergy, we determined one of the issues to be leaky can lights in the ceiling.  Each can light is merely a 6" diameter hole that allows heated air to escape, and cold drafts in during the winter.

    Rock wool can light covers lessen this leakage and also provide a necessary thermal and ignition barrier from the hot can light to protect against the possibility of fires.

  • Hot Bedroom-Stephens City, VA - Before Photo
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    Hot Bedroom-Stephens City, VA - After Photo
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    Hot Bedroom-Stephens City, VA

    Vertical walls with little/no, or fiberglass insulation on them allow the 130 degree attic heat to radiate through the drywall into a bedroom. SilverGlo foam boards (4" thick) can fix this problem.

  • New Attic Insulation in Winchester, VA - Before Photo
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    New Attic Insulation in Winchester, VA - After Photo
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    New Attic Insulation in Winchester, VA

    A home in Winchester, VA had an attic with very little insulation. The Comfenergy Crew came out and properly air sealed and insulated the attic. Insulating your attic can help prevent air from escaping the house and stop outside air from coming in. Heating and cooling costs account for up to 50-70 percent of the energy used in an average home. 

  • Dense Packing a Cathedral Ceiling - Before Photo
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    Dense Packing a Cathedral Ceiling - After Photo
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    Dense Packing a Cathedral Ceiling

    Cellulose Insulation was used to dense pack the cathedral ceiling of this cottage that had no insulation in the attic.  We also found a cantilevered section that required dense packing as well.

  • Front Royal Wall Insulation - Dense Packing - Before Photo
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    Front Royal Wall Insulation - Dense Packing - After Photo
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    Front Royal Wall Insulation - Dense Packing

    This Front Royal VA home had a detached garage with living space above.  The garage was often too hot in the summer or too cold in the winter.  Our Sales Professional Pedro identified an opportunity to improve those issues by dense packing the walls with insulation.  Our production team removed sections of siding before making hole in the plywood frame of the walls and then used tubes to blow i and pack the insulation into the empty cavities of the wall frame.  

  • Front Royal VA Attic Duct Management - Before Photo
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    Front Royal VA Attic Duct Management - After Photo
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    Front Royal VA Attic Duct Management

    Sometimes it can be helpful to improve the existing infrastructure in an attic to optimize energy efficiency for our clients.  in addition to air sealing and adding insulation, this Front Royal VA home had extra length in the HVAC duct system running through the attic.  Although it was well insulated, there was excessive distance for the conditioned air to travel, making it harder to deliver at the intended temperatures.  Our production crew shortened it in sections and created a platform and damning system to allow for walking and or storage in the attic near its opening.  A new attic hatch was installed which can zip closed when access to the attic is not needed.  

  • Fire Protection-White Post, VA - Before Photo
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    Fire Protection-White Post, VA - After Photo
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    Fire Protection-White Post, VA

    These before/after pictures are of Rcok Wool insulation being wrapped around a furnace flue pipe in the attic.  This rock wool is a flame resistant type insulation material that keeps the heat away from the fiberglass or cellulose insulation.  Thus, protecting the house from catching fire!!!

     

2020 #1 Dealer in the Network

2020 #1 Dealer in the Network

Inc. 5000 List

Inc. 5000 List

Loudoun County Chamber Small Business of the Year Award

Loudoun County Chamber Small Business of the Year Award

#1 Dealer in the Country for Dr. Energy Saver

#1 Dealer in the Country for Dr. Energy Saver

Loudoun's Favorite Insulation Company 2019

Loudoun's Favorite Insulation Company 2019

Best Picks 2019

Best Picks 2019

Best of Loudoun - 2019

Best of Loudoun - 2019

#2 Dr. Energy Saver Dealer in the Country

#2 Dr. Energy Saver Dealer in the Country

2018 Superior Service Business of the Year

2018 Superior Service Business of the Year

2018 Best of Loudoun Award

2018 Best of Loudoun Award

Entrepreneur Small Business Award

Entrepreneur Small Business Award

Angie's List Super Service Award

Angie's List Super Service Award

Best of Loudoun 2018

Best of Loudoun 2018

Dr. Energy Saver-#3 Dealer in North America

Dr. Energy Saver-#3 Dealer in North America

EBSCO Best Pick Report

EBSCO Best Pick Report

Innovative Business of the Year-2016

Innovative Business of the Year-2016

Loudoun Now-Favorite Insulation Company 2017

Loudoun Now-Favorite Insulation Company 2017

Service Business of the Year Finalist-2015

Service Business of the Year Finalist-2015

Comfenergy Grand Opening

Comfenergy Grand Opening

Entrepreneur of the Year-2015

Entrepreneur of the Year-2015