
Get matched with top energy efficiency auditors in Londonderry, NH
Enter your zip and get matched with up to 5 pros
Need a pro for your energy efficiency auditing project in Londonderry, NH?
Verified Reviews for Energy Efficiency Auditing pros in Londonderry, NH
*The Angi rating for Energy Efficiency Auditing companies in Londonderry, NH is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Energy Efficiency Auditing needs.
*The HomeAdvisor rating for Energy Efficiency Auditing companies in Londonderry, NH is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Energy Efficiency Auditing needs.
Last update on December 13, 2025
Find Energy efficiency auditors in Londonderry

Infrared Diagnostic LLC
Infrared Diagnostic LLC
HERS rater providing energy audit and infrared building diagnostic to home owners, home buyers and commercial properties. Service include Infrared scan, Blower Door leak testing and Duct Blaster leak testing. We perform our inspections and structure our reports with clients needs in mind. The result is a clear, concise report and most importantly a satisfied client! HERS rater service to new home builders, 2012 IECC code HVAC duct leak and blower-door testing Certified RESNET HERS Rater Certified BPI Building Analyst Certified Level 3 Infrared Thermographer Wondering how you can make your home easier on the environment, while simultaneously increasing comfort and lowering energy bills? Our home energy efficiency services can help you accomplish all these goals and more. By analyzing the house as a system and looking at the interrelationships between each of your home's components -- building envelope (insulation, windows, doors, air sealing), combustion equipment (boilers, furnaces, water heaters), etc. -- we're able to identify the key sources of discomfort, indoor air quality, and energy waste in your home. We're then able to target the areas with the greatest return on investment so you get the greatest home improvement for the best value. Other infrared services are: Infrared electric system panel hot spot scan. Infrared flat roof scan for moisture damage. Infrared ratiant floor heat and plumbing scan.
"Infrared Diagnostics is an independent Energy Auditing company. Flemming is great to work with because he's a consummate professional at what he does. Very knowledgeable about building energy issues and in my case I needed an expert I could trust to tell me what I needed and to prove it with science. Flemming did exactly that by providing me with an infrared scan to show me what and where the problems in my home. With this information, and Flemming's recommendations, I can now speak to contractors intelligently and direct them to perform the work that I need done to make sure that the problems are resolved and the job is done as efficiently as possible in a way that saves me time and money. Thanks for your time and advice on how to resolve the issues Flemming!"
Ron G on February 2020
HERS rater providing energy audit and infrared building diagnostic to home owners, home buyers and commercial properties. Service include Infrared scan, Blower Door leak testing and Duct Blaster leak testing. We perform our inspections and structure our reports with clients needs in mind. The result is a clear, concise report and most importantly a satisfied client! HERS rater service to new home builders, 2012 IECC code HVAC duct leak and blower-door testing Certified RESNET HERS Rater Certified BPI Building Analyst Certified Level 3 Infrared Thermographer Wondering how you can make your home easier on the environment, while simultaneously increasing comfort and lowering energy bills? Our home energy efficiency services can help you accomplish all these goals and more. By analyzing the house as a system and looking at the interrelationships between each of your home's components -- building envelope (insulation, windows, doors, air sealing), combustion equipment (boilers, furnaces, water heaters), etc. -- we're able to identify the key sources of discomfort, indoor air quality, and energy waste in your home. We're then able to target the areas with the greatest return on investment so you get the greatest home improvement for the best value. Other infrared services are: Infrared electric system panel hot spot scan. Infrared flat roof scan for moisture damage. Infrared ratiant floor heat and plumbing scan.
"Infrared Diagnostics is an independent Energy Auditing company. Flemming is great to work with because he's a consummate professional at what he does. Very knowledgeable about building energy issues and in my case I needed an expert I could trust to tell me what I needed and to prove it with science. Flemming did exactly that by providing me with an infrared scan to show me what and where the problems in my home. With this information, and Flemming's recommendations, I can now speak to contractors intelligently and direct them to perform the work that I need done to make sure that the problems are resolved and the job is done as efficiently as possible in a way that saves me time and money. Thanks for your time and advice on how to resolve the issues Flemming!"
Ron G on February 2020

Seacoast Inspections LLC
Seacoast Inspections LLC
Licensed Home Inspector #698 MA, #107 NH ASHI Certified Inspector #247162, Certified Level II Building Science Thermographer #31162, EDR Certified, Certified WDI Registry Inspector #90113. No Fee guarantee!
Licensed Home Inspector #698 MA, #107 NH ASHI Certified Inspector #247162, Certified Level II Building Science Thermographer #31162, EDR Certified, Certified WDI Registry Inspector #90113. No Fee guarantee!

CAL'S AIR CONDITIONING AND HEATING
CAL'S AIR CONDITIONING AND HEATING
Cal's Air Conditioning and Heating. Sole Proprietership, in business since 1994, locally owned and operated, owner Ernest Calderone. Billing-paid upon completion of service or installation.
"Very pleased with the Mitsubishi ductless a/c system Cal's installed. Prompt and professional. Highly recommended."
kim k on August 2018
Cal's Air Conditioning and Heating. Sole Proprietership, in business since 1994, locally owned and operated, owner Ernest Calderone. Billing-paid upon completion of service or installation.
"Very pleased with the Mitsubishi ductless a/c system Cal's installed. Prompt and professional. Highly recommended."
kim k on August 2018

New England Clean Energy
New England Clean Energy
New England Clean Energy Inc. designs, installs and services solar electric, battery systems, and provides solar-related services and repair. The company has installed more than 1,200 solar energy systems for homeowners, businesses and nonprofit organizations in New Hampshire, Rhode Island and Massachusetts. Founded in 2006, New England Clean Energy has more positive reviews on SolarReviews.com than any installer in the northeast. Headquartered in Hudson, Mass., the company also has an office in Providence, R.I. and will soon be opening an office in New Hampshire. To see a searchable picture library of some of our work visit https://newenglandcleanenergy.com/residential/photos/ You can search by type of installation, roof type, town or state.
"We consider ourselves very lucky for having chosen New England Clean Energy as our solar installer. From the beginning to the end of the project, NECE was responsive, punctual, helpful and very focused on giving us the best - we always felt they put us, their customer, first. We are very happy customers, secure in the knowledge that no matter what issues may come up with our system, NECE is a phone call or an email away, with courteous, prompt answers. We wholeheartedly recommend them."
Teodros G on January 2019
New England Clean Energy Inc. designs, installs and services solar electric, battery systems, and provides solar-related services and repair. The company has installed more than 1,200 solar energy systems for homeowners, businesses and nonprofit organizations in New Hampshire, Rhode Island and Massachusetts. Founded in 2006, New England Clean Energy has more positive reviews on SolarReviews.com than any installer in the northeast. Headquartered in Hudson, Mass., the company also has an office in Providence, R.I. and will soon be opening an office in New Hampshire. To see a searchable picture library of some of our work visit https://newenglandcleanenergy.com/residential/photos/ You can search by type of installation, roof type, town or state.
"We consider ourselves very lucky for having chosen New England Clean Energy as our solar installer. From the beginning to the end of the project, NECE was responsive, punctual, helpful and very focused on giving us the best - we always felt they put us, their customer, first. We are very happy customers, secure in the knowledge that no matter what issues may come up with our system, NECE is a phone call or an email away, with courteous, prompt answers. We wholeheartedly recommend them."
Teodros G on January 2019

A&E AIR CONDITIONING & REFRIGERATION
A&E AIR CONDITIONING & REFRIGERATION
Residential Commercial Installs Refrigeration A/C Installation Ductless A/C services A/C repairs Heater repair Thermostat repair
"Installation was quick and did not encounter any issues. Mr. D’Entremont was friendly and professional. I would definitely call him again for any HVAC services I need."
Sue R on September 2022
Residential Commercial Installs Refrigeration A/C Installation Ductless A/C services A/C repairs Heater repair Thermostat repair
"Installation was quick and did not encounter any issues. Mr. D’Entremont was friendly and professional. I would definitely call him again for any HVAC services I need."
Sue R on September 2022
Downeast Energy
Downeast Energy
Additional email - [email protected]. Additional DBA - Downeast Energy & Building Supply.
"Highly advise not to use them for any installation jobs. Sloppy work, incorrect with regulator placement and double billed after another experienced technician did the job. Even the experienced technician did a half assed job reconnecting an exhaust vent that he decided to remove to run the gas line which did not need to be removed. cannot get ahold of customer service to discuss or dispute the service bill which then has my oil and gas deliveries on hold. I prepaid for the gas delivery while under dispute and am being double billed. I may just find a more reliable local person as this big time company with small time feelis simply not working out."
Randall R on December 2025
Additional email - [email protected]. Additional DBA - Downeast Energy & Building Supply.
"Highly advise not to use them for any installation jobs. Sloppy work, incorrect with regulator placement and double billed after another experienced technician did the job. Even the experienced technician did a half assed job reconnecting an exhaust vent that he decided to remove to run the gas line which did not need to be removed. cannot get ahold of customer service to discuss or dispute the service bill which then has my oil and gas deliveries on hold. I prepaid for the gas delivery while under dispute and am being double billed. I may just find a more reliable local person as this big time company with small time feelis simply not working out."
Randall R on December 2025

Gutter Helmet d/b/a Moonworks Home Improvement
Gutter Helmet d/b/a Moonworks Home Improvement
Jim Moon started Gutter Helmet of New England in 1993. Gutter Helmet quickly grew and homeowners began asking him to install other products. What started as a gutter protection company, quickly grew into one of New England's premiere home improvement companies, Moonworks Home Improvement. In addition to Gutter Helmet, Moonworks also provides high quality products including; Heated Helmet, Ice Defense, Dr. Energy Saver, and GAF Roofing.
"I would void these guys like the plague. The original estimate for their "Ice Defense" system was # 3700 and I was told I needed to figure a couple of hundred dollars additional to have their electrician connect the wiring. After the install, I come to find out that their electrician actually wanted over $ 5000 to do the wiring. That's right FIVE THOUSAND ! After a months worth of e-mails and calls back and forth they finally hooked me up with a different electrician that said he got calls like these from a lot of their customers and the cheapest he could do it for was THREE THOUSAND. More calls and more e-mails and they finally agree to split the cost (to avoid small claims court), and the units are finally wired up. Of course by now the first winter is over so I never actually turn them on until the following winter. When I finally do get to use them, my first electric bill is almost $300 higher than any previous bill ever. Contacted them about that and never heard back. Just had them on this winter for ONE DAY during the last storm and my bill is almost $150 dollars higher than the previous month ... FOR ONE DAYS USE. A complete and total waste of time and money."
Carl S on January 2018
Jim Moon started Gutter Helmet of New England in 1993. Gutter Helmet quickly grew and homeowners began asking him to install other products. What started as a gutter protection company, quickly grew into one of New England's premiere home improvement companies, Moonworks Home Improvement. In addition to Gutter Helmet, Moonworks also provides high quality products including; Heated Helmet, Ice Defense, Dr. Energy Saver, and GAF Roofing.
"I would void these guys like the plague. The original estimate for their "Ice Defense" system was # 3700 and I was told I needed to figure a couple of hundred dollars additional to have their electrician connect the wiring. After the install, I come to find out that their electrician actually wanted over $ 5000 to do the wiring. That's right FIVE THOUSAND ! After a months worth of e-mails and calls back and forth they finally hooked me up with a different electrician that said he got calls like these from a lot of their customers and the cheapest he could do it for was THREE THOUSAND. More calls and more e-mails and they finally agree to split the cost (to avoid small claims court), and the units are finally wired up. Of course by now the first winter is over so I never actually turn them on until the following winter. When I finally do get to use them, my first electric bill is almost $300 higher than any previous bill ever. Contacted them about that and never heard back. Just had them on this winter for ONE DAY during the last storm and my bill is almost $150 dollars higher than the previous month ... FOR ONE DAYS USE. A complete and total waste of time and money."
Carl S on January 2018

Ideal Comfort HVAC
Ideal Comfort HVAC
If you find your air conditioning or heating units not working properly, call us immediately. We proudly serve Southern New Hampshire and the Merrimack Valley at affordable prices with our work. Ideal Comfort can provide full maintenance and service for your HVAC system in your home, small commercial building or office. Our team of knowable technicians are ready to tackle anything from small to complex jobs.
"They were very friendly, reliable, and did excellent work. I highly recommend them."
RuthAnn W on August 2022
If you find your air conditioning or heating units not working properly, call us immediately. We proudly serve Southern New Hampshire and the Merrimack Valley at affordable prices with our work. Ideal Comfort can provide full maintenance and service for your HVAC system in your home, small commercial building or office. Our team of knowable technicians are ready to tackle anything from small to complex jobs.
"They were very friendly, reliable, and did excellent work. I highly recommend them."
RuthAnn W on August 2022

Moonworks Home Improvement
Moonworks Home Improvement
For over 20 years, Moonworks has operated around one core principle, that the customer deserves the very best. Over the past two decades, Moonworks has expanded the product line include quality brands like Gutter Helmet, EcoView windows & doors, Dr. Energy Saver insulation and energy saving products, Ice Defense featuring Heated Helmet and GAF Master Elite certified roofing. Though our company has expanded, our principle remains the same: provide first-class customer service and offer the very best materials combined with professional installation.
"i have been acting as an agent/advocate for my mom who is 87. she had a roof installed which has had numerous leaks. 2 in garage (now taken care of) where solar lines go through to roof panels.; 1 from improperly sealed window (also ok now) leaking into 3 season porch, causing water damage; 1 around improperly flashed chimney (paid another company $1800 to repair), and now, another one where roof meets vertical end wall of house (leaking into 2nd floor ceiling and down wall into kitchen). Have been calling company for OVER A MONTH and still have not gotten any help from them. They DO NOT RETURN PHONE CALLS!!! Customer service (Ashley and Ryan) have both "left messages for Jesse" as well as "reaching out to him personally". I now have left messages on his cell, and WILL BE FILING COMPLAINT WITH BBB, Office of Elderly Affairs, AG, and State Board of Licensing!! ****STAY AWAY*** ***READ REVIEWS*** (here AND on other sites!!)"
m k on November 2018
For over 20 years, Moonworks has operated around one core principle, that the customer deserves the very best. Over the past two decades, Moonworks has expanded the product line include quality brands like Gutter Helmet, EcoView windows & doors, Dr. Energy Saver insulation and energy saving products, Ice Defense featuring Heated Helmet and GAF Master Elite certified roofing. Though our company has expanded, our principle remains the same: provide first-class customer service and offer the very best materials combined with professional installation.
"i have been acting as an agent/advocate for my mom who is 87. she had a roof installed which has had numerous leaks. 2 in garage (now taken care of) where solar lines go through to roof panels.; 1 from improperly sealed window (also ok now) leaking into 3 season porch, causing water damage; 1 around improperly flashed chimney (paid another company $1800 to repair), and now, another one where roof meets vertical end wall of house (leaking into 2nd floor ceiling and down wall into kitchen). Have been calling company for OVER A MONTH and still have not gotten any help from them. They DO NOT RETURN PHONE CALLS!!! Customer service (Ashley and Ryan) have both "left messages for Jesse" as well as "reaching out to him personally". I now have left messages on his cell, and WILL BE FILING COMPLAINT WITH BBB, Office of Elderly Affairs, AG, and State Board of Licensing!! ****STAY AWAY*** ***READ REVIEWS*** (here AND on other sites!!)"
m k on November 2018
Conservation Services Group Inc
Conservation Services Group Inc
300 employees. Uses subs. Cost is determined by the job. May contact through email. Additional fax - (508) 836-3183.
300 employees. Uses subs. Cost is determined by the job. May contact through email. Additional fax - (508) 836-3183.
The Londonderry, NH homeowners’ guide to energy efficiency auditing services
From average costs to expert advice, get all the answers you need to get your job done.
•Discover the average home energy audit cost, what impacts pricing, and how to save money on your audit. Get transparent, expert-backed cost info for homeowners.

A home energy audit is a detailed write-up of how to lower your utility bills and increase your comfort level. Find out if they’re worth the cost.
•Get a detailed breakdown of thermal imaging home inspection costs, including average prices, cost factors, and tips to help homeowners budget.

Home energy audits can identify ways to make your home more energy-efficient. Learn whether an energy audit is a good investment for your home.
- Derry, NH Energy efficiency auditors
- Litchfield, NH Energy efficiency auditors
- Windham, NH Energy efficiency auditors
- Merrimack, NH Energy efficiency auditors
- Hudson, NH Energy efficiency auditors
- Manchester, NH Energy efficiency auditors
- Bedford, NH Energy efficiency auditors
- Auburn, NH Energy efficiency auditors
- Salem, NH Energy efficiency auditors
- Pelham, NH Energy efficiency auditors
- Chester, NH Energy efficiency auditors
- Nashua, NH Energy efficiency auditors
- Hampstead, NH Energy efficiency auditors
- Sandown, NH Energy efficiency auditors
- Atkinson, NH Energy efficiency auditors
- Amherst, NH Energy efficiency auditors
- Hollis, NH Energy efficiency auditors
- Candia, NH Energy efficiency auditors
- Tyngsboro, MA Energy efficiency auditors
- Dracut, MA Energy efficiency auditors
- Hooksett, NH Energy efficiency auditors
- Danville, NH Energy efficiency auditors
- Methuen, MA Energy efficiency auditors
- Milford, NH Energy efficiency auditors
- Plaistow, NH Energy efficiency auditors
- Raymond, NH Energy efficiency auditors
- Dunstable, MA Energy efficiency auditors
- Fremont, NH Energy efficiency auditors
- Mont Vernon, NH Energy efficiency auditors
- Lowell, MA Energy efficiency auditors
- Plumbing in Londonderry
- Kitchen And Bath Remodeling in Londonderry
- Electrical in Londonderry
- Roofing in Londonderry
- Siding in Londonderry
- Tree Service in Londonderry
- Lawn And Yard Work in Londonderry
- Flooring in Londonderry
- Landscaping in Londonderry
- Handyman Service in Londonderry
- Pest Control in Londonderry
- Driveways in Londonderry
- Exterior Painting in Londonderry
- Excavating in Londonderry
- Pressure Washing in Londonderry
- Swimming Pools in Londonderry
- Doors in Londonderry
- Fireplaces in Londonderry
- Remodeling Basements in Londonderry
- Leaf Removal in Londonderry
- Septic Tank in Londonderry
- Dumpster Rental in Londonderry
- Fencing in Londonderry
- Land Surveying in Londonderry
- Deck Maintenance in Londonderry
- Painting in Londonderry
- Garbage Collection in Londonderry
- Mailbox Repair in Londonderry
- Epoxy Flooring in Londonderry
- Carpet Cleaning in Londonderry
- 🌱 "Mow a small front yard"
- 🛠 "Fix a leaking pipe under the sink"
- 🏠 "Repair shingles on an asphalt roof"





