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  • Average homeowner rating star icon4.7
    Average homeowner rating
  • Verified reviews icon35
    Verified energy efficiency auditing services reviews

Top-Rated Energy efficiency auditors in Reston - Updated Nov 2026

Avatar for EDGE Energy
EDGE Energy
4.5(
51
)
Home Energy Audit

Serving Reston, VA and surrounding areas

Approved

In business since 2006

Free estimates

Emergency services offered

"We hired Edge Energy to do a full house remodel (3,000 sq. ft.,two floors, kitchen, living room, dining room, family room, breakfast space, four bedrooms, two full baths and a powder room, laundry room). This is a little outside their normal scope but we really liked the company owner, Jason Dispenza and he set up a favorable pricing schedule that didn't include some of the exorbitant management fees we have seen with other contractors. They started with an energy audit which helped to determine some of the aspects of the systems upgrades we would need. We changed the room configuration on both floors, replaced major systems (water heater, HVAC,electrical, etc.) replaced windows and put in new window openings, installed support beams, replaced the roof, insulation, electrical upgrade and lighting, replaced much of the hardwood flooring, drywall, paint and added a new front entry with a new porch. It was a major job which we lived through for months with the exception of about two weeks when the drywall work was being done. Our living there caused Edge some additional work, but they were considerate of protecting what remained in the house, and making the space as livable as possible. The result is beautiful and we probably have one of the most energy efficient homes in our area of Maryland. The Edge crew was great to work with, very considerate and careful to not disrupt our life more than necessary. Mike Hogan, the project manager was very good to work with, attentive to concerns and very responsive to suggestions. During many weeks we were talking daily. Most subs were very good as well- the HVAC, roofing and drywall guys were great. Our only concerns were with the plumber who delayed the project considerably and the final cost of the project was higher than the estimate we had originally received. I would highly recommend Edge Energy for their work and their customer responsiveness. They are technically highly competent and are very good people to work with."
Infrared finds air leaks!
All PM's are certifed under BPI, NCI, RESNET, NAHB
Air-sealing and insulating attics is our SPECIALTY
Locally Owned Business
Weatherization Truck

+5

Recommended by89%of homeowners
Avatar for Comfenergy
Comfenergy
3.9(
50
)
Home Energy AuditEnergy Audit - For Business

Serving Reston, VA and surrounding areas

Approved

In business since 2013

Free estimates

Warranties offered

"I am so impressed with Comfenergy. The sales rep explained why we only needed to improve the insulation at the top of our unfinished basement walls, not the whole thing as another company recommended. So it was considerably less money than we thought we’d need to do the job. Brent and his assistant arrived on time to do the work and were so quiet that we weren’t inconvenienced in any way. I definitely recommend this company."
Attic before
Attic after
Historic Waterford Home
Historic Plaque
Crawl space before

+6

Response time1 day
113 neighbors recently requested a quote
Recommended by84%of homeowners
Avatar for 3 PROS Basement System
3 PROS Basement System
4.0(
39
)
Home Energy AuditEnergy Audit - For Business

Serving Reston, VA and surrounding areas

Approved

In business since 2020

Free estimates

Warranties offered

"Friendly people from estimation through installation. Everyone was very thorough, especially during the initial energy audit, and the work was completed in a timely manner."
Crawl Space Before Picture
Finished!
Beautiful Encapsulated Crawl space
SaniDry Sedona
Spray Foamed walls

+32

Response time1 day
83 neighbors recently requested a quote
Recommended by86%of homeowners
Reliance Repair LLC
4.9(
68
)
Energy Audit - For BusinessHome Energy Audit

Serving Reston, VA and surrounding areas

Free estimates

Credit card accepted

"Our LG above stove microwave stopped heating. Lucky from Reliance Repair came out and gave us an estimate. He arrived on time. His estimate was reasonable. When he received the part, he returned on time and worked diligently to repair the problem. He was polite, respectful. Overall, an excellent repair experience. Highly recommended."
Additional Photos
Recommended by98%of homeowners
Avatar for Stephen Palmer Electric Inc
Stephen Palmer Electric Inc
4.6(
144
)
Energy Audit - For BusinessHome Energy Audit

Serving Reston, VA and surrounding areas

In business since 1994

Credit card accepted

"the tech arrived on time he looked over the issue, provided feedback on the way to handle the problem and went to work. When the tech was done I walked through the area requesting service and was happy with the outcome"
Old House Specialists
We pride ourselves on working quickly, cleanly, and efficiently.
Recommended by87%of homeowners
Avatar for Evergreen Electric LLC
Evergreen Electric LLC
4.9(
36
)
Energy Audit - For BusinessHome Energy Audit

Serving Reston, VA and surrounding areas

In business since 2009

Free estimates

Emergency services offered

"We wanted to try a local contractor and came across Evergreen by chance.  It was an excellent experience.  Thad was knowledgeable and professional and easy to work with.  The crew was exactly the same.  Nice, respectful, competent.  The worked around my crazy schedule as we had other improvements going on.  They had a slight delay in getting the generator as there was a back order, but called and let us know and we worked around it.  Laurie in the office was equally good and kept us in communication on details or things to do and schedule etc.  I could not be more happy with the experience on such a big purchase.  They were always accommodating and helpful.  The Generator and switch were high quality and I think the price was fair.  They even did some easy side things for us for no charge.  We will definitely use them again soon to install an attic fan."
Recommended by100%of homeowners
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Energy Efficiency Auditing FAQs, answered by experts

R-value is calculated by dividing the thickness of an insulation material by its thermal conductivity. The material's composition and density influence thermal conductivity. Materials with lower conductivity values provide better insulation. The higher the R-value, the better the material is at insulating, helping homeowners select insulation that meets the energy needs of their climate and home layout.

A good SEER rating for an HVAC system is typically between 15 and 20. However, minimum requirements vary by location; HVAC systems in northern states must have at least a 14 SEER rating, while those in southern states need a minimum of 15. For the highest possible efficiency, look for units with a SEER rating of 21 or higher. It's important to remember that a SEER rating represents the maximum efficiency a unit can achieve, not the level at which it will operate at all times.

There are energy-efficient options when building a cottage. Select green building materials, high-performance insulation, and energy-efficient windows when designing your cottage. Options such as solar panels, efficient HVAC systems, and LED lighting can lower your utility bills and reduce your environmental impact. Many builders offer energy-efficient upgrades as part of the design process.

Yes, installing an attic fan can help lower your electric bill—particularly if you live in a hot and humid region. By replacing hot and stuffy air with cooler air, these fans help regulate the temperature in your attic and the rest of your home, taking some of the pressure off of your air conditioner.

Dryers are designed to use as little electricity as possible, but power is still required to run the motor that turns the drum and to heat an element that pumps hot air. Eco devices are available and may lead to cost savings in the long term, but you should run the figures before committing to an eco-friendly device as they are often much more expensive to purchase.

The Reston, VA homeowners’ guide to energy efficiency auditing services

From average costs to expert advice, get all the answers you need to get your job done.