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Verified Reviews for Energy Efficiency Auditing pros in Longmont, CO
*The Angi rating for Energy Efficiency Auditing companies in Longmont, CO 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 Longmont, CO 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 Longmont

REenergizeCO, Inc.
REenergizeCO, Inc.
REenergizeCO is an approved contractor through Xcel Energy and Efficiency Works that specializes in home energy audits and insulation upgrades that improve the quality and efficiency of existing residential homes along the front range. Properly installed insulation in the attic, walls, crawl space, garage, basement, and air sealing are a few of the services offered. Reach out to schedule an energy audit or a free estimate with one of our BPI-certified technicians.
"The inspection went well. It's after the inspection that is terrible. Telling me that I need these things done to improve the then charging an astronomical amount of money. I was willing to do some of the work. Sent a list of what I would like done and got a new estimate, with virtually had the same as the first. Only change was to eliminate some insulation. I believe they try to put one over on people."
Todd S on December 2024
REenergizeCO is an approved contractor through Xcel Energy and Efficiency Works that specializes in home energy audits and insulation upgrades that improve the quality and efficiency of existing residential homes along the front range. Properly installed insulation in the attic, walls, crawl space, garage, basement, and air sealing are a few of the services offered. Reach out to schedule an energy audit or a free estimate with one of our BPI-certified technicians.
"The inspection went well. It's after the inspection that is terrible. Telling me that I need these things done to improve the then charging an astronomical amount of money. I was willing to do some of the work. Sent a list of what I would like done and got a new estimate, with virtually had the same as the first. Only change was to eliminate some insulation. I believe they try to put one over on people."
Todd S on December 2024

Liberty Home Inspections, LLC
Liberty Home Inspections, LLC
We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!
"All around good quality work for a good price.."
Jay R on May 2016
We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business!
"All around good quality work for a good price.."
Jay R on May 2016
Standard Renewable Energy
Standard Renewable Energy
Standard Renewable Energy, provides energy efficiency and renewable energy solutions that help customers lower energy bills, reduce their environmental impact and increase their energy independence.
"They were friendly, honest (so many other contractors outright lie to you), accurate with their bid, prompt with keeping the installation appointment and thorough from the initial contact to the completion of the job. Service rep followed up with an inspection after the job was complete. Only 2 things I could say were slightly annoying were the screws left on the garage floor (but I was expecting some anyway from a previous contractor's work) and the fact that the sales rep did not deliver the rebate forms until it was almost too late to claim the rebate."
Marie J on June 2010
Standard Renewable Energy, provides energy efficiency and renewable energy solutions that help customers lower energy bills, reduce their environmental impact and increase their energy independence.
"They were friendly, honest (so many other contractors outright lie to you), accurate with their bid, prompt with keeping the installation appointment and thorough from the initial contact to the completion of the job. Service rep followed up with an inspection after the job was complete. Only 2 things I could say were slightly annoying were the screws left on the garage floor (but I was expecting some anyway from a previous contractor's work) and the fact that the sales rep did not deliver the rebate forms until it was almost too late to claim the rebate."
Marie J on June 2010
Bestway Insulation, LLC
Bestway Insulation, LLC
Home Pro of the Year in 2010 (Service Magic)Home Performance Contractor of the Year for the last 8 out of 10 years. We are a company that specializes in re-insulating existing homes by using blown-in insulation and getting huge reductions on our customers energy bills by Air Sealing and compressing fiberglass or rockwool in the walls and Dense packing it tight.Where most companies are happy getting 10%energy reductions on their clients homes, we want 50% or higher. Our family has owned and operated Bestway Insulation, LLC, in Colorado since 1976. Born & raised CO. Top Rebate producer for air sealing in 2009 - 2021. Home Performance with energy star Contractor of the year 21 out of 23 Years starting with NREL when they were doing it in 1996. I want huge results for my clients.
Home Pro of the Year in 2010 (Service Magic)Home Performance Contractor of the Year for the last 8 out of 10 years. We are a company that specializes in re-insulating existing homes by using blown-in insulation and getting huge reductions on our customers energy bills by Air Sealing and compressing fiberglass or rockwool in the walls and Dense packing it tight.Where most companies are happy getting 10%energy reductions on their clients homes, we want 50% or higher. Our family has owned and operated Bestway Insulation, LLC, in Colorado since 1976. Born & raised CO. Top Rebate producer for air sealing in 2009 - 2021. Home Performance with energy star Contractor of the year 21 out of 23 Years starting with NREL when they were doing it in 1996. I want huge results for my clients.

DMC Services
DMC Services
Multiple Angieslist Super Service Award Winner. Family owned and operated Business since 2001. Over 25yrs in the HVAC Industry. NATE and EPA Trained Employees. Excel Energy Contractor. Authorized RHEEM Pro Partner Contractor. BBB + Accredited. Full Service Repair/Replacement on all Air Conditioning and Furnaces, Evaporative Coolers, H20 Heaters. Service all major brands. Also install full line of Aprilaire indoor air quality products. Electronic air cleaners, humidifiers. Light commercial work, and Full preventative maintenance contracts. Also install whole house attic fans, roof vents, ceiling fans. Plumbing, Electrical, fireplace service.
"Overall, just a great experience. I had a new air conditioner installed. Les was incredibly knowledgeable and answered all of my questions as well as providing information to care for the air conditioner. He even fixed issues on my furnace from the previous installers shoddy work at no charge. I highly recommend using DMC Services for your HVAC needs."
John C on June 2023
Multiple Angieslist Super Service Award Winner. Family owned and operated Business since 2001. Over 25yrs in the HVAC Industry. NATE and EPA Trained Employees. Excel Energy Contractor. Authorized RHEEM Pro Partner Contractor. BBB + Accredited. Full Service Repair/Replacement on all Air Conditioning and Furnaces, Evaporative Coolers, H20 Heaters. Service all major brands. Also install full line of Aprilaire indoor air quality products. Electronic air cleaners, humidifiers. Light commercial work, and Full preventative maintenance contracts. Also install whole house attic fans, roof vents, ceiling fans. Plumbing, Electrical, fireplace service.
"Overall, just a great experience. I had a new air conditioner installed. Les was incredibly knowledgeable and answered all of my questions as well as providing information to care for the air conditioner. He even fixed issues on my furnace from the previous installers shoddy work at no charge. I highly recommend using DMC Services for your HVAC needs."
John C on June 2023

Colorado Home Services
Colorado Home Services
CHS is a local, veteran-owned licensed electrical contractor that provides full residential electrical services with deep expertise in whole house fans, attic fans and ventilation, sun tunnels and skylights. We have been providing the most environmentally friendly, cost-effective and energy-efficient home cooling and daylighting solutions in Colorado since 2003. We pride ourselves on delivering an un-matched customer service experience. From pricing to install, our team is dedicated to earning your trust and finding the best home cooling and daylighting solutions for your home, no matter what! Offering industry-leading brands and a wide range of products suited for any home, we are Colorado's premier home electrical, cooling and daylighting provider.
"When it comes to home services, CHC sets the bar exceedingly high. They installed a whole house fan that dramatically reduced the amount I need to run my AC. They were on time, professional, and completed the install faster than expected (~3.5 hours). They cleaned up after and took some time to train me on the many ways I could use the fan to save energy and improve comfort in my home, some of which I wouldn't have thought of. In an industry where low expectations seems to be the norm, to say that CHC exceeds expectations is an understatement."
Tyler N on September 2022
CHS is a local, veteran-owned licensed electrical contractor that provides full residential electrical services with deep expertise in whole house fans, attic fans and ventilation, sun tunnels and skylights. We have been providing the most environmentally friendly, cost-effective and energy-efficient home cooling and daylighting solutions in Colorado since 2003. We pride ourselves on delivering an un-matched customer service experience. From pricing to install, our team is dedicated to earning your trust and finding the best home cooling and daylighting solutions for your home, no matter what! Offering industry-leading brands and a wide range of products suited for any home, we are Colorado's premier home electrical, cooling and daylighting provider.
"When it comes to home services, CHC sets the bar exceedingly high. They installed a whole house fan that dramatically reduced the amount I need to run my AC. They were on time, professional, and completed the install faster than expected (~3.5 hours). They cleaned up after and took some time to train me on the many ways I could use the fan to save energy and improve comfort in my home, some of which I wouldn't have thought of. In an industry where low expectations seems to be the norm, to say that CHC exceeds expectations is an understatement."
Tyler N on September 2022

Scott Home Inspection LLC
Scott Home Inspection LLC
Professional home inspection company serving the northern Colorado area including Larimer, Weld, Boulder, Adams, Broomfield, Jefferson and Denver counties. All inspections conducted according to American Society of Home Inspectors (ASHI) Standards-of-Practice & Code-of-Ethics. Certified Radon & Mold testing. On-line Scheduling of Inspections. On-site generation & printing of Inspection Report Summary. Internet access to Full Inspection Report. Why Scott Home Inspection? 15+ years experience in residential remodeling & electrical engineering project management. Candidate Member with ASHI - the most respected home inspection organization in North America. E&O Insurance Coverage + General Liability Insurance. Graduate ASHI Home Inspector Training Program. On-line, Real-Time Scheduling of Inspections. Web-based Inspection Report & Email Notification.
"Great service and attention to detail."
Jonny R on November 2019
Professional home inspection company serving the northern Colorado area including Larimer, Weld, Boulder, Adams, Broomfield, Jefferson and Denver counties. All inspections conducted according to American Society of Home Inspectors (ASHI) Standards-of-Practice & Code-of-Ethics. Certified Radon & Mold testing. On-line Scheduling of Inspections. On-site generation & printing of Inspection Report Summary. Internet access to Full Inspection Report. Why Scott Home Inspection? 15+ years experience in residential remodeling & electrical engineering project management. Candidate Member with ASHI - the most respected home inspection organization in North America. E&O Insurance Coverage + General Liability Insurance. Graduate ASHI Home Inspector Training Program. On-line, Real-Time Scheduling of Inspections. Web-based Inspection Report & Email Notification.
"Great service and attention to detail."
Jonny R on November 2019

Key Heating & Air dba Oneguy Heating & Cooling
Key Heating & Air dba Oneguy Heating & Cooling
Your Heating & Air Conditioning Service Expert for over 20 years! As much as half of the energy used in your home goes to heating and cooling system. Making educated decisions about your home’s heating, ventilating, and air conditioning (HVAC) system can have a big effect on your utility bills — and your comfort. If your heating or air conditioning system is more than 10 years old, consider having them evaluated by the HVAC expert of Oneguy . We are an army of 4. I am a small company offering a higher quality installation of high efficiency equipment and system design in new custom homes or fixing all the trax homes that will not heat or cool with an Arzel wholehouse zoning system. A perfect solution for your basement finish project that will fix all your problems on the upper floors. Oneguy does not use sub-contractors unless it is a lic. plumber, electrician, to do any work out of my field to complete the job. I am lic. in Denver and most all metro cities and carry 2 million liability insurance. As an American Standard Dealer, I can provide you with the best furnaces and air conditioning units on the market as listed by consumer reports and consumer digest. You can look that up on thier web sites. Call Oneguy where quality takes priority 720-560-7100
"Excellent. Very professional, Final cost came in under estimate, substantially below competitive bid and with equipment."
Phil and Donna S on September 2020
Your Heating & Air Conditioning Service Expert for over 20 years! As much as half of the energy used in your home goes to heating and cooling system. Making educated decisions about your home’s heating, ventilating, and air conditioning (HVAC) system can have a big effect on your utility bills — and your comfort. If your heating or air conditioning system is more than 10 years old, consider having them evaluated by the HVAC expert of Oneguy . We are an army of 4. I am a small company offering a higher quality installation of high efficiency equipment and system design in new custom homes or fixing all the trax homes that will not heat or cool with an Arzel wholehouse zoning system. A perfect solution for your basement finish project that will fix all your problems on the upper floors. Oneguy does not use sub-contractors unless it is a lic. plumber, electrician, to do any work out of my field to complete the job. I am lic. in Denver and most all metro cities and carry 2 million liability insurance. As an American Standard Dealer, I can provide you with the best furnaces and air conditioning units on the market as listed by consumer reports and consumer digest. You can look that up on thier web sites. Call Oneguy where quality takes priority 720-560-7100
"Excellent. Very professional, Final cost came in under estimate, substantially below competitive bid and with equipment."
Phil and Donna S on September 2020

Stellar Windows and Insulation
Stellar Windows and Insulation
Windows, Replacement Windows, Insulation, Energy Efficiency Auditing
Windows, Replacement Windows, Insulation, Energy Efficiency Auditing

REenergizeCO Inc
REenergizeCO Inc
We are a Denver-based home energy auditing company that believes basic building science errors are handicapping our local energy grid. REenergizeCO is an approved contractor with both Xcel and Denver Energy challenge, and we help you fill out all of the required paperwork to get the rebates from these programs.
"I had a great experience with REenergizeCO. They installed new insulation in the attic and crawlspace of my townhome. What a difference! The crew was efficient, helpful, and friendly, and the estimate was completely thorough. Dexter was wonderful to work with."
Sherri L on August 2024
We are a Denver-based home energy auditing company that believes basic building science errors are handicapping our local energy grid. REenergizeCO is an approved contractor with both Xcel and Denver Energy challenge, and we help you fill out all of the required paperwork to get the rebates from these programs.
"I had a great experience with REenergizeCO. They installed new insulation in the attic and crawlspace of my townhome. What a difference! The crew was efficient, helpful, and friendly, and the estimate was completely thorough. Dexter was wonderful to work with."
Sherri L on August 2024
FAQs for energy efficiency auditing projects in Longmont, CO
An energy audit costs about $420 on average, ranging from $100 to $2,250, depending on the size of your home, property, location, and the tests the auditor needs to perform. Keep in mind that the 2022 Inflation Reduction Act’s Energy Efficient Home Improvement credit covers up to $150 of home energy audit costs. Common energy audit tests include:
Blower door test: $350
Duct testing: $100
HERS test: $375
HERS certification: $200
Infrared imaging: $200
The difference between an energy auditor and a home inspector is primarily in the purpose of the inspection. The energy auditor conducts tests in your home to determine the energy efficiency levels in areas like windows, insulation, and doorways. The auditor then makes recommendations for ways to improve a home’s energy efficiency.
A home inspector examines various structures of your home to determine that everything is up to code and gauge the condition of features like the roof, foundation, HVAC, and electrical. The home inspector reports on the overall home and makes repair recommendations.
Typically, a local home energy auditor is responsible for performing energy audits. A home energy auditor will conduct one of three energy audits designed by the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) to determine the energy efficiency of your home. The auditor often provides analysis that can help guide changes and improvements to your home for better energy efficiency, giving recommendations as necessary.
The three levels of home energy audits include:
Level 1: Review of your energy bills and home for signs of energy inefficiency and areas for improvement. The average cost range is $0.08 to $0.12 per square foot.
Level 2: A level 2 ASHRAE energy audit costs $0.12 and $0.35 per square foot. In-depth analysis of your energy usage and provides a report of cost-saving changes.
Level 3: Comprehensive analysis and detailed recommendations for ways to improve your home’s energy efficiency. A level 3 audit costs about $0.36 to $0.50 per square foot.
To find a reputable energy auditor, find a local company that offers energy audit services. Research the company’s reviews, methods, and certifications to find a reliable professional in your area. The most reputable energy audit companies are HEP-certified by the Building Performance Institute (BPI). Be sure to check our state licensing tool to review the local energy auditor guidelines to ensure you’re hiring a certified professional.
The Longmont, CO 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.
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