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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

I service ALL makes and models of heating equipment. Oil, gas/propane, heat pumps, water heaters, boilers (hot water and steam) and refrigeration equipment. I do both residential and commercial work. All work comes with warranties. Licensed and insured. PA098480 \n\nOil furnace/boiler cleaning $159.00, \nGas furnace clean/tune-up $ 69.00\nHeat pump clean/tune-up $ 79.00\n\nMilitary, Senior, Public service(Fire/Police) Discounts\nNO ADDED OVERTIME OR WEEKEND RATES....EVER!!! Same price any time. Any day. Including holidays.\n30 years' experience !!!!\nFREE estimates on new equipment replacements\nFREE 2nd opinions\n\n302-669-9167

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

"Ben, the owner, came to our home for a total evaluation of how we might improve comfort and save energy. The focus and area of most concern was the basement, where air leakage was causing some first-floor rooms to feel colder than others. Kyle and John spent roughly seven hours using spray foam at accessible rim joists, lining the walls of the crawl space, and adding insulation to two exterior doors. Since it has been only a week, we don't know if we will see monetary saving, but we are pleased that our first level floors no longer have the cold spots. The guys were pleasant, kept us informed throughout the day, and showed us what had been done before they left. Thank you Home Energy & Comfort!"
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 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

Operate 24/7 for emergency service to repair your heating, cooling and water heating equipment, Specialize in Installation, Service Repairs & Maintenance. Also perform Energy Audits & Duct Cleaning. We Service All Makes & Models of your HVAC Equipment that are Natural Gas, Electric, Propane or Oil. Call us today at 1-877-844-4822!

Recommended by95%of homeowners
Avatar for Advanced Services Plus Inc
Advanced Services Plus Inc
5.0(
7
)
Energy Audit - For BusinessHome Energy Audit

Serving Exton, PA and surrounding areas

In business since 2015

Free estimates

Emergency services offered

We believe that it is our responsibility at Advanced Services Plus to provide our residential and commercial customers with the best possible service. Whether, we do a new install, replace an old one or a service call, we are here for you. We provide reliable furnace and air conditioning repair and installation services. With a combined experience of over twenty-five years in the industry, we have seen a bit of everything and will use that experience to provide unmatched services for our customers. \nContact us today for exceptional service. \nWe look forward to your call. \n

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Recommended by100%of homeowners
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Energy Efficiency Auditing FAQs, answered by experts

A home energy audit costs about $420 on average, with prices ranging from $100 to $2,250 or more. The final cost depends on factors like your home's size, location, the thoroughness of the audit, and the specific tests performed. A basic Level 1 walk-through inspection typically costs between $150 and $200, while a comprehensive Level 3 audit with detailed testing and a report costs around $900. Homeowners may be able to use the 2022 Inflation Reduction Act’s Energy Efficient Home Improvement credit to cover up to $150 of the audit cost.

Costs for common individual tests include:

  • Blower door test: $350

  • Duct testing: $100

  • HERS test: $375

  • HERS certification: $200

  • Infrared imaging: $200

When combined with a substantial solar system, if you have enough Powerwalls, you could go off-grid and be energy independent. But remember, you'd need enough Powerwalls to power your whole home continuously because a single Powerwall can’t power large appliances for extended periods. One Powerwall is able to power an average-sized home's emergency circuits, lights, and outlets. To power large appliances, you likely need two or three Powerwalls.

Blower door tests are measured in a few different ways, but the most popular are air changes per hour (ACH) and cubic feet of air (CFM) moving through the house per hour. A good ACH score is less than 2ACH, but 1ACH is better. This means the house experiences a total air change within 60 minutes (for 1ACH). For 2ACH, there’s a complete change every 30 minutes, and so on. CFM scores are similar in that a lower score means less air change, and therefore less leakage.

Yes, most audits include a report with prioritized recommendations for improving energy efficiency. Confirm with your auditor.

The number one culprit of high energy bills is older appliances, especially fridges and freezers that are left on all the time. These two appliances tend to last a long time, which is good, but it also means that newer models are usually significantly more energy-efficient due to upgraded technology. The second most common reason for a high bill is heating and air conditioning.

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.