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Verified Reviews for Energy Efficiency Auditing pros in Belvidere, IL

*The Angi rating for Energy Efficiency Auditing companies in Belvidere, IL 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 Belvidere, IL 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 15, 2025

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Avatar for Perma-Seal Basement Systems

Perma-Seal Basement Systems

4.56(
1,162
)
•Approved Pro

Perma-Seal Basement Systems

4.56(
1,162
)
•Approved Pro
Customers say: Super punctual
46 years of experience
Free onsite estimate

Perma-Seal specializes in protecting the value of your home backed by 45 years of serving the Chicagoland and NW Indiana areas. Our basement waterproofing stops leaks and flooding, our foundation repairs fix settling and bowed walls, and our crawl space solutions control humidity and improve air quality. Our concrete lifting and leveling service offers a reliable, quick, and highly effective way to repair your sunken, cracked driveway, patio, pool deck, or sidewalk for a fraction of the cost of replacement. Additionally, we provide yard drainage solutions, sewer and plumbing services, and home comfort solutions such as air sealing, and insulation to ensure your home remains in top condition. What sets us apart? Our commitment to superior customer service and our solid warranty. Any product or work covered by our warranty is serviced free of charge for the entire warranty period. Choose Perma-Seal for reliable, quality solutions to keep your home safe and comfortable.

"Great job! Delivered exactly what was promised. Efficient and professional."

Nemura P on December 2025

Perma-Seal specializes in protecting the value of your home backed by 45 years of serving the Chicagoland and NW Indiana areas. Our basement waterproofing stops leaks and flooding, our foundation repairs fix settling and bowed walls, and our crawl space solutions control humidity and improve air quality. Our concrete lifting and leveling service offers a reliable, quick, and highly effective way to repair your sunken, cracked driveway, patio, pool deck, or sidewalk for a fraction of the cost of replacement. Additionally, we provide yard drainage solutions, sewer and plumbing services, and home comfort solutions such as air sealing, and insulation to ensure your home remains in top condition. What sets us apart? Our commitment to superior customer service and our solid warranty. Any product or work covered by our warranty is serviced free of charge for the entire warranty period. Choose Perma-Seal for reliable, quality solutions to keep your home safe and comfortable.

"Great job! Delivered exactly what was promised. Efficient and professional."

Nemura P on December 2025

Avatar for Daniel Nagel

Daniel Nagel

4.90(
37
)
•Approved Pro

Daniel Nagel

4.90(
37
)
•Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
11 years of experience

Get the B.E.S.T for your home (Building Energy Services and Testing) from ZENERGY LLC. We strive to help our clients find the 'ZEN' in their homes, that point where there improved comfort and the utility bills aren't emptying your pocket. We take a whole house approach to identify and resolve any issues within the home's attic, basement, or crawl space to improve the homes performance against the weather. Our services focus on targeted air sealing, increasing the insulation, installing proper ventilation, or making adjustments to the home to improve the comfort. ZENERGY is your one stop for full home energy auditing or home performance improvements. Let us help solve your homes energy consumption and comfort issues with our 3D approach. We are able to Discover the root cause of the issue. Design a solution for repair and Deliver the corrective action to improve the situation. WWW.greenzenergy.com 773-710-1090

"We reached out to Dan with the issue of freezing pipes and cold rooms in our old house. Dan inspected the house and proposed a plan to remedy these issues. Aside from the more traditional air sealing and insulation solutions, Dan also recommended insulating the area of our house above our soffit, which was difficult to access but that appeared to be a major insulation issue. I should add the other firms we requested quotes for did not identify this area in their proposal. I firmly believe the proposals from the other firms would not have fixed our issues. Dan worked for ~2 weeks on air sealing our attic and house, adding insulation to our attic, removing our soffit and adding insulation and reinstalling soffit. Work was done well and within budget and at a fair price. Dan is very easy to work with and takes pride in his work. We are very happy to report our pipes have not frozen and the cold rooms are no longer cold - would highly recommend Dan to others - he went above and beyond."

Daniel C on January 2023

Get the B.E.S.T for your home (Building Energy Services and Testing) from ZENERGY LLC. We strive to help our clients find the 'ZEN' in their homes, that point where there improved comfort and the utility bills aren't emptying your pocket. We take a whole house approach to identify and resolve any issues within the home's attic, basement, or crawl space to improve the homes performance against the weather. Our services focus on targeted air sealing, increasing the insulation, installing proper ventilation, or making adjustments to the home to improve the comfort. ZENERGY is your one stop for full home energy auditing or home performance improvements. Let us help solve your homes energy consumption and comfort issues with our 3D approach. We are able to Discover the root cause of the issue. Design a solution for repair and Deliver the corrective action to improve the situation. WWW.greenzenergy.com 773-710-1090

"We reached out to Dan with the issue of freezing pipes and cold rooms in our old house. Dan inspected the house and proposed a plan to remedy these issues. Aside from the more traditional air sealing and insulation solutions, Dan also recommended insulating the area of our house above our soffit, which was difficult to access but that appeared to be a major insulation issue. I should add the other firms we requested quotes for did not identify this area in their proposal. I firmly believe the proposals from the other firms would not have fixed our issues. Dan worked for ~2 weeks on air sealing our attic and house, adding insulation to our attic, removing our soffit and adding insulation and reinstalling soffit. Work was done well and within budget and at a fair price. Dan is very easy to work with and takes pride in his work. We are very happy to report our pipes have not frozen and the cold rooms are no longer cold - would highly recommend Dan to others - he went above and beyond."

Daniel C on January 2023

Avatar for Building Energy Experts Insulation and Supply

Building Energy Experts Insulation and Supply

4.62(
157
)

Building Energy Experts Insulation and Supply

4.62(
157
)
Customers say: Super punctual
18 years of experience

Building Energy Experts is the leading building energy auditor, energy retrofit, blow and spray foam insulation, led lighting, and alternative energy specialist for government, commercial, and residential applications since 2008. Building energy experts looks at your building as a complex system, we run a series of diagnostic tests to pinpoint exactly why your building isn’t as energy efficient, healthy, comfortable, and green as it should be. The results of our tests tell us exactly how to improve your building. BPI certified building scientists. Nicor/ Peoples Gas/ North Shore Gas/ ComEd Energy Smart Contractor.

"We just had our attic and crawl space insulated and a moisture barrier put in. The crew showed up on time and every one of them was polite and professional. We could tell they had a lot of experience working together because they were super organized. While the boss, Dave, walked us through the process in detail, making sure we understood the job, behind him the crew set up quickly and efficiently, treating our home with respect. They were finished right on time, too, and left our house looking as if they had never been there. Before they left, Dave showed us their work and explained how these improvements would make our home more energy efficient. Every crew member made sure to say goodbye to us. They were amazing people! We highly recommend Building Energy Experts."

Eve S on May 2024

Building Energy Experts is the leading building energy auditor, energy retrofit, blow and spray foam insulation, led lighting, and alternative energy specialist for government, commercial, and residential applications since 2008. Building energy experts looks at your building as a complex system, we run a series of diagnostic tests to pinpoint exactly why your building isn’t as energy efficient, healthy, comfortable, and green as it should be. The results of our tests tell us exactly how to improve your building. BPI certified building scientists. Nicor/ Peoples Gas/ North Shore Gas/ ComEd Energy Smart Contractor.

"We just had our attic and crawl space insulated and a moisture barrier put in. The crew showed up on time and every one of them was polite and professional. We could tell they had a lot of experience working together because they were super organized. While the boss, Dave, walked us through the process in detail, making sure we understood the job, behind him the crew set up quickly and efficiently, treating our home with respect. They were finished right on time, too, and left our house looking as if they had never been there. Before they left, Dave showed us their work and explained how these improvements would make our home more energy efficient. Every crew member made sure to say goodbye to us. They were amazing people! We highly recommend Building Energy Experts."

Eve S on May 2024

Avatar for D&H Energy Management Company LLC

D&H Energy Management Company LLC

4.46(
13
)

D&H Energy Management Company LLC

4.46(
13
)
Customers say: Quick response
21 years of experience

Additional email - [email protected]. Additional DBA - DH Insulation, an Energy Management Co.

Additional email - [email protected]. Additional DBA - DH Insulation, an Energy Management Co.

Avatar for Euro-Tech, Inc

Euro-Tech, Inc

4.29(
49
)

Euro-Tech, Inc

4.29(
49
)
Customers say: True professional
33 years of experience

Euro-Tech, Inc. has been the Midwest's premier home improvement company for over 23 years .

"The crew that was sent was professional and thorough. All the old windows (approximately 20) were removed by noon and all the new windows were installed, sealed, and cleaned by the end of the normal work day. A crack developed in one a couple of years later and, while it took a bit of time due to Holidays and the onset of the Pandemic to get the window ordered, Tom and Niko (the service people sent to replace it) were equally as thorough and professional. It took longer to fill out the paper work than it took them to remove and replace the cracked window. We have noticed a significant drop in our heating and cooling costs after the installation of these windows. They are a bit pricey but that is because the quality is superior. If you want good solid windows that look great for your house or business, I highly recommend Eurotech, Inc."

Keith L on September 2020

Euro-Tech, Inc. has been the Midwest's premier home improvement company for over 23 years .

"The crew that was sent was professional and thorough. All the old windows (approximately 20) were removed by noon and all the new windows were installed, sealed, and cleaned by the end of the normal work day. A crack developed in one a couple of years later and, while it took a bit of time due to Holidays and the onset of the Pandemic to get the window ordered, Tom and Niko (the service people sent to replace it) were equally as thorough and professional. It took longer to fill out the paper work than it took them to remove and replace the cracked window. We have noticed a significant drop in our heating and cooling costs after the installation of these windows. They are a bit pricey but that is because the quality is superior. If you want good solid windows that look great for your house or business, I highly recommend Eurotech, Inc."

Keith L on September 2020

Avatar for GreenLink Energy Solutions

GreenLink Energy Solutions

5.00(
5
)

GreenLink Energy Solutions

5.00(
5
)
Customers say: Quick response
14 years of experience

Greenlink Energy Solutions is located in Rockford, IL. Our focus is to provide your home, business, or building the most efficient and green solutions for your home. We guarantee quality work that provides the best results which means decreased utility bills, higher level of comfort, eliminating drafts, and ensuring your home is at peak performance. We provide numerous options not only for insulation but for solar panel installation as well. We're partnered with programs in Wisconsin and Illinois to provide financing, discounts, and incentives for your home or place of business.

"We have worked with Greenlink on multiple projects and have been satisfied on them all. They have completed everything from drywall, painting, new insulation and concrete foundation work for us. The work was done in a professional manner and on schedule."

Dave B on October 2018

Greenlink Energy Solutions is located in Rockford, IL. Our focus is to provide your home, business, or building the most efficient and green solutions for your home. We guarantee quality work that provides the best results which means decreased utility bills, higher level of comfort, eliminating drafts, and ensuring your home is at peak performance. We provide numerous options not only for insulation but for solar panel installation as well. We're partnered with programs in Wisconsin and Illinois to provide financing, discounts, and incentives for your home or place of business.

"We have worked with Greenlink on multiple projects and have been satisfied on them all. They have completed everything from drywall, painting, new insulation and concrete foundation work for us. The work was done in a professional manner and on schedule."

Dave B on October 2018

Avatar for Ikon Electric

Ikon Electric

5.00(
2
)

Ikon Electric

5.00(
2
)
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

IKON Electric is your full-service electrical company.

"See description above. Excellent Job."

Cathleen S on January 2018

IKON Electric is your full-service electrical company.

"See description above. Excellent Job."

Cathleen S on January 2018

Solar Wolf Energy

2.00(
2
)

Solar Wolf Energy

2.00(
2
)
10 years of experience

Solar Wolf is a full service solar company with a great reputation and an old world belief to our customers. To under-promise and over-deliver, period. We have 18 years experience in construction, remodeling, roofing, solar water heaters, solar pv systems, battery back-up systems and much more. See what Solar Wolf Energy can do for you!

Solar Wolf is a full service solar company with a great reputation and an old world belief to our customers. To under-promise and over-deliver, period. We have 18 years experience in construction, remodeling, roofing, solar water heaters, solar pv systems, battery back-up systems and much more. See what Solar Wolf Energy can do for you!

Avatar for Alternative Energy Solutions

Alternative Energy Solutions

No reviews yet

Alternative Energy Solutions

No reviews yet
24 years of experience

sales and installation of solar electric(photovoltaic), solar thermal(hot water), solar hot air, energy efficiency auditing, solar design consultant, certified solar site assessor, solar fire safety

sales and installation of solar electric(photovoltaic), solar thermal(hot water), solar hot air, energy efficiency auditing, solar design consultant, certified solar site assessor, solar fire safety

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FAQs for energy efficiency auditing projects in Belvidere, IL

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 Belvidere, IL homeowners’ guide to energy efficiency auditing services

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

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