Top-rated energy efficiency auditors.

Best energy efficiency auditors near Derby, CT

Enter your zip and get matched with up to 5 pros

Need a pro for your energy efficiency auditing project in Derby, CT?

Select your specific project to find the pro for you.

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

Avatar for Gabriel Hahn
Gabriel Hahn
New to Angi
Home Energy Audit

Serving Derby, CT and surrounding areas

Approved

Emergency services offered

Small jobs welcome

Credit card accepted

I conduct energy audit tests for homes, whether they are colonial or brand new construction. I can recommend you various forms of weathersealant, thermal wrappings, and storm window techniques, saving you thousands in the form of long-term heat insulation tech-forward solutions.

Rachel Solar Specialist
New to Angi
Energy Audit - For BusinessHome Energy Audit

Serving Derby, CT and surrounding areas

Approved

In business since 2021

Free estimates

We pride our company on reliability, great communication, integrity, and quality work. We believe in giving our absolute best in all of our projects, no matter how big or small. You will find us to be competitively priced, with close attention to the details of each and every project. We are experts in our trade and will always keep you educated on your particular task or project. We look forward to earning your business, so please ask us for references. \n

Response time9 hrs
Avatar for Wesson Energy Inc
Wesson Energy Inc
4.5(
32
)
Energy Audit - For BusinessHome Energy Audit

Serving Derby, CT and surrounding areas

In business since 1935

Emergency services offered

Credit card accepted

"The guys that came out to do our home energy audit where very professional.  They gave me an overall explanation of what they would be doing and as they did their work they updated me regularly as to what they where about to do next as they completed each part.   They found my boiler was a bit out of spec on the amount of CO2 it was producing and I suggested i have it looked at.  I took them up on getting one of their maintance teams over to look at it and to my surprise they where able to be here before the Home energy audit guys left so they where able to explain what they found face to face.  It turned out to be nothing major just a bent piece of metal a little to close to the flame cause a lose of efficient burn.
"
Additional Photos
Additional Photos
Additional Photos
Recommended by90%of homeowners
Avatar for New England Conservation Services, LLC
New England Conservation Services, LLC
4.9(
8
)
Home Energy Audit

Serving Derby, CT and surrounding areas

In business since 2006

Free estimates

Credit card accepted

"We have had NECS to our home several times for different projects: energy audit, attic insulation, and wall insulation. These are very professional, considerate, and honest people to do such work in your home. Our house is much more energy efficient after all we have done. Insulation pays for itself very quickly, and NECS took care of all incentive programs for us. You won't go wrong with them."
Sidewall Insulatiiom
Spinsulated house
Response time6 days
Recommended by100%of homeowners
Avatar for NEW ENGLAND SMART ENERGY
NEW ENGLAND SMART ENERGY
4.9(
13
)
Energy Audit - For BusinessHome Energy Audit

Serving Derby, CT and surrounding areas

In business since 2009

Emergency services offered

"I could not be more pleased with this company or this service. I found them here on AL and with a rebate, it was a great deal. When I called, the woman who answered was extremely polite and helpful and took the time to go over the entire audit process with me (she wasn't rushed as some receptionists are). They sent an email to confirm the date and time.
When the team arrived, they were on time and each of them introduced themselves by name to me before coming into my house. They were all very polite and courteous. The leader (I can't remember his name) gave me an overview of the process and explained things as they went. Basically, they simulate high winds around the house and then monitor for where leaks are. My house is relatively new and has no basement, so it was already pretty efficient, but there were some major leaks by the front door and attic door, which they sealed on the spot. They also showed me that I could hold my hand over any electrical socket, even ones on interior walls, and feel the "wind"--which means air was leaking out those! So I plugged them all with those little socket protectors. The guys also took me into the attic and showed me some leaks, and fixed them--and fixed the attic door by adding a little latch to help it stay closed. All in all, they reduced the amount of air getting into my house by 500 (I forget the units). It was clear they didn't just make up this number--they showed me the number after the first test and then after the second test (when they had treated the problem areas).
I also got a few free CFLs and LEDs, and bought 3 more LEDs since they were at a great price. They left some rebates with me, although all my appliances are new so I didn't need anything. 
When they left, they each said goodbye and were very professional until the end. They were respectful in my home and asked before opening any closets or doors, etc. I felt very safe with them here, which is not always the case when people are in your home working. I think the price is a fantastic one, especially with the AL rebate that was on when I scheduled. I feel I got my money's worth. My husband and I had tried to plug some leaks ourselves, but we didn't really know what we were doing and we had no way to measure if we were really helping anything. This audit gave me hard numbers to look at and I was impressed that they did the fixes on-site (included in the price--for instance, they plugged a whole around my front door frame by installing a clear plastic barrier). It was a great deal and a great experience. Highly recommend!
Bonus--when we resell this house in a few years, I will definitely list that we got a professional energy audit performed on it and that it's very efficient. Definitely a selling point!
"
Additional Photos
Additional Photos
Additional Photos
NESEG Certified Techs
Blower Door Test

+38

Recommended by91%of homeowners
Avatar for R & R Heating & Cooling
R & R Heating & Cooling
5.0(
18
)
Energy Audit - For BusinessHome Energy Audit

Serving Derby, CT and surrounding areas

In business since 2001

Free estimates

Emergency services offered

"It was excellent. Ramon was incredibly thorough in terms of checking everything. Anytime there's any issue I can call him and troubleshoot through the phone, and if not, he'll come over and fixed it."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+19

Response time1 day
Response rate100%
Recommended by100%of homeowners
Avatar for R&J Solar LLC
R&J Solar LLC
5.0(
2
)
Energy Audit - For BusinessHome Energy Audit

Serving Derby, CT and surrounding areas

In business since 2022

Free estimates

Credit card accepted

We provide residential and commercial solar power options, and provide support services for industry partner companies. We offer no cost consultations and $0 down financing. Please contact our office for a consultation at (931)922-8258.

Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+3

Recommended by100%of homeowners
Avatar for Vista Home Improvement
Vista Home Improvement
4.3(
419
)
Energy Audit - For BusinessHome Energy Audit

Serving Derby, CT and surrounding areas

In business since 2005

Free estimates

Emergency services offered

"The technician who came was a pleasant, competent professional who examined the unfinished attic to evaluateit w/r/t insulation only or insulation as part of a full finishing of the space. He took measurements and scratched out some information on his pad.. I told him that I intended to review my options before any decision. I offered payment at that time and he told me there was no charge for this service. It struck me as odd that he told me that what I had agreed to pay $19.00 for was actually free but I asumed billing would accompany an actual report/proposal. A month on I've never seen anything like a report although I have been charged via credit card for the inspection service. Perhaps the report-recommendation is still on its way? PLEASE NOTE THAT THIS REVIEW FORM REQUIRES A YES/NO HIRE AGAIN RESPONSE. I WOULD HAVE PREFERRED TO ANSWER UNDECIDED."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+41

Recommended by87%of homeowners
Showing 1-10 of 19
Energy Efficiency Auditing FAQs, answered by experts

STC (Sound Transmission Class) is a rating that describes how well a building material or assembly blocks airborne sound. A higher STC rating means less noise will pass through the material, providing better sound reduction. This rating system applies to various building components, including windows, doors, flooring, drywall, and insulation.

For context, a typical single-pane window has an STC rating of around 25 (where normal conversations are audible), while a well-sealed, double-pane window can exceed STC 45 (blocking loud speech and most music). It is important to note that for some products, like soundproofing drywall, the STC rating refers to the entire wall system, not just the individual panel.

Additionally, STC ratings are most effective for measuring sound reduction at mid-to-high frequencies, such as human speech, and may not accurately reflect how well a material blocks low-frequency sounds like bass music or thunder. Because of these factors, it is recommended to consult a professional to determine the right STC-rated materials for your specific soundproofing needs.

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.

While you can perform many routine home maintenance jobs yourself, it’s often a good idea to bring pros in for certain tasks. HVAC maintenance, fireplace and chimney inspections, foundation repairs, and roof inspections and repairs should be handled by professionals who know what to look for and can safely perform repairs. You may also find it helpful to hire a local house cleaning service to help with deep cleaning.

Leaving vents open but closing doors in unused rooms will probably not save money on your energy bill. Closed doors prevent the natural flow of air throughout the home, which could reduce the efficiency of the overall HVAC system. They could also restrict airflow into and through the return vents, making the HVAC system less efficient.

Yes, barndominiums are energy-efficient as long as insulation professionals properly install quality insulation, windows, and doors. Utility bills for barndo living can be up to 50% lower than those for a traditional home.  Make your barndo more energy efficient by working with contractors and HVAC professionals to strategically place windows, doors, and heating/cooling systems. 

The Derby, CT homeowners’ guide to energy efficiency auditing services

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