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  • Average homeowner rating star icon4.8
    Average homeowner rating
  • Verified reviews icon40
    Verified energy efficiency auditing services reviews

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

Avatar for E S G, Inc.
E S G, Inc.
4.7(
126
)
Home Energy Audit

Serving Exton, PA and surrounding areas

Approved

In business since 1981

Free estimates

Credit card accepted

"I had a problem room that had little insulation. Cold in the winter. Hot in the summer. No attic access. Energy services group was able to drill large holes in the ceiling & outside wall and spray in insulation. Then plug the holes and spackle. Replaced canister lights with led ones. They explained to my wife what they were going to do before it happened. Then said what they actually were able to accomplish. Great communication. Quick to schedule. Cleaned up after themselves. A quality company"
Freshly blown insulation with Baffles installed
Insulated foundation walls
Replacing damaged duct with new insulated duct
Newly installed crawl space access door
Insulated air tight pull down stair cover

+4

Response time12 hrs
Response rate95%
Recommended by97%of homeowners
Old Skool HVAC,LLC
4.4(
11
)
Energy Audit - For BusinessHome Energy Audit

Serving Exton, PA and surrounding areas

Approved

In business since 1982

Emergency services offered

Warranties offered

"These guys are the best. we moved into a new house back in June and had the hot water heater die after a few weeks. Frank was out the next day with a new hot water heater, at a excellent price. Both my wife and I were extremely happy with the work done, the price we were given and the customer service we got. Since then we have had two other 'emergencies' (air conditioner/leaky pipe in bathroom) and these guys came out right away and fixed the problems at excellent prices. Each time we had them at our house, they were very detailed about what the problem was and how they were going to fix it. Our HVAC is 25 years old and on it last legs. We've already asked Frank about it, and as soon as we are able to, we'll be calling Old Skool for our new one."
Response time1 day
7 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Strictly Business Home and Commercial Inspections
Strictly Business Home and Commercial Inspections
4.4(
59
)
Energy Audit - For BusinessHome Energy Audit

Serving Exton, PA and surrounding areas

In business since 1984

Free estimates

Credit card accepted

"Ira was cordial and professional. He has practical experience and knowledge of residential energy audits. He was able to provide useful suggestions but not definitive solutions to issues. That may have been due to inaccessible interior walls. I am frustrated that a full written report that had been promised still has not been produced six weeks later."
Response time7 hrs
Recommended by77%of homeowners
Avatar for Home Energy and Comfort, LLC
Home Energy and Comfort, LLC
4.8(
55
)
Home Energy Audit

Serving Exton, PA and surrounding areas

In business since 2015

Free estimates

Warranties offered

"I have lived in my house for two years, and have had problems with rooms that wouldn't get cool in the summer (despite central air conditioning), or stay warm in the winter. I had to move my bedroom after the first summer and winter, and could not comfortably sit for long in my living room. I replaced all my windows with triple paned ones in March 2020, which made little difference. I had PECO do an energy assessment of my home last spring. Home Energy & Comfort was on PECO's list of recommended contractors. I researched them further, and their reviews were impressive. I soon found out why. Gordon Clark, one of the co-owners, and a crew of three to four workers spent two days at my home in early June 2020. To make a long story short, they insulated everywhere that needed it (including the garage which is underneath my living room), air sealed gaps and cracks where needed, sealed up ducts, spray foamed rim and band-joist area, and did air seal blowing tests before and after the work. The team was always polite and respectful, and masked due to the Coronavirus. They protected everywhere they worked with plastic sheets and tarps, and cleaned up well afterward. They also did all the work to submit paperwork for rebates from PECO, and deducted the rebate amounts from my bill rather than have me wait for them. This has honestly been the best money I have invested in my home. The hot days have shown me the vast improvement in energy efficiency. I was able to move my bedroom back to the bigger room in the southwest corner, which is now very comfortable. An added bonus is the reduction of dust in my home. I am very happy I chose Home Energy & Comfort to do the work in my home!"
BPI GoldStar Contractor
Blower Door Test
Truck
Adding Attic Insulation
Response time1 day
Recommended by100%of homeowners
Avatar for Harmon Heating & Air Conditioning
Harmon Heating & Air Conditioning
4.8(
84
)
Energy Audit - For BusinessHome Energy Audit

Serving Exton, PA and surrounding areas

In business since 2009

Free estimates

Emergency services offered

"My 10-year old air conditioner was not cooling . I tried replacing the outdoor unit capacitor but this didn't fix the problem. I took advantage of Harmon Heating 's $30 check up fee and my unit was diagnosed with an evaporator leak.  Bruce (the business owner) explained to me that the cost of fixing it (about $1750) is not worth it because of the age and that the type of refrigerant being used (R-22 or Freon) is being phased out. He provided a comprehensive website with all options available to me. I did my due diligence by researching the market  to make sure that I wasn't being taken advantage of. I found that the prices are reasonable (of course, I would have saved a lot of money if I buy the equipment myself but that will be too risky and I do understand that businesses need to make money too). I wasn't at all pressured to totally replace my  system. Since I'm an avid environmentalist  (I drive a Prius and watched all episodes of Cosmos) and have the cash to spend, I decided to replace the unit with a newer, more energy efficient model that use less harmful refrigerant (Puron). I also decided to replace the furnace with a more efficient model to maximize the efficiency of the whole system. When I expressed interest with one option, Bruce came back the next day to perform a load calculation on the house to make sure that the tonnage is right for my house. The results of this calculation was given to me right after the installation. The installation commenced the same week and took only one day. Bruce performed the work himself (with the help of an assistant). After the install, proper cleanup of the site was performed. He patiently answered all my questions. He also explained to me that the gas supplier needs to adjust the pressure and that he'll return in the fall to make sure this is done as it is essential for the system to work correctly. When I complained about the furnace using the old condenser pump, he explained that it wasn't part of the original contract. But he returned the next day with a new condenser pump even without being asked, to make sure that I'm 100% satisfied. He also helped me with the rebate process (I got $400 rebate from Peco). When Peco's website appeared to not recognize the model as 'rebatable' . I emailed Bruce and I got the assurance that he'll pay me the amount of the rebate himself (and in turn get the supplier to reimburse him). Fortunately, this did not have to happen as Peco already sent me the check. I'm very satisfied with the new system and the overall experience with the service provider.
"
Additional Photos
Recommended by96%of homeowners
Avatar for Mark Group
Mark Group
4.4(
467
)
Energy Audit - For BusinessHome Energy Audit

Serving Exton, PA and surrounding areas

In business since 1974

Free estimates

Credit card accepted

"Person who visited was very polite and noted that what I purchased was likely not something that would meet my expectations.  I wanted an energy audit, how my systems could be improved in home, lighting, heating, insulation and air conditioners.  What I got was a list of things they could work on and the price to do that work.  The work list in no way was considered an energy audit, rather it was a punch list of things I could do based on their visual inspection.  I did not have a comparison of work and benefit/savings calculation.  There was no checklist of inefficiencies and how that translated into energy losses. For example, multiple hi hat lights in house, they spoke about boxing and insulating a few, less than 10, when I have almost 90 in house.  Overall I was disappointed, the tech who came said the offering needed to be better presented prior to start of work."
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+14

Recommended by83%of homeowners
Avatar for UGI Heating Cooling & Plumbing
UGI Heating Cooling & Plumbing
4.4(
77
)
Energy Audit - For BusinessHome Energy Audit

Serving Exton, PA and surrounding areas

In business since 1892

Free estimates

Emergency services offered

"Estimator came out quickly, was very personable, and could schedule my install appointment a few weeks later right then and there. When the tech came out he was polite, efficient, and very quick.  Overall I was very happy with the service and would recommend them to others if the price is competitive with another company.
"
Recommended by95%of homeowners
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Energy Efficiency Auditing FAQs, answered by experts

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.

HVAC systems use the most household electricity. This major and essential system is responsible for heating and cooling your home all year round. Since they operate for a significant amount during the day, it consumes more energy than other appliances. 

Expert installation optimizes insulation properties, cutting energy costs and enhancing home comfort year-round.

Electric bills tend to be lower in spring and fall because people use less electricity during these seasons. Milder temperatures allow for less use of heating and cooling, unlike during winter and summer, which usually bring more extreme temperatures.

To find a reputable home energy auditor, start by researching local companies that offer the service and check their reviews, methods, and certifications. The most reputable professionals are often Home Energy Professional (HEP)-certified by the Building Performance Institute (BPI). You can also consult the Department of Energy’s certified list of energy auditors or use a state licensing tool to review local guidelines and ensure you are hiring a certified professional for your area.

The Exton, PA homeowners’ guide to energy efficiency auditing services

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