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Verified Reviews for Energy Efficiency Auditing pros in Willmar, MN

*The Angi rating for Energy Efficiency Auditing companies in Willmar, MN 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 Willmar, MN 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 31, 2025

Find Energy efficiency auditors in Willmar

Avatar for RetroGreen Energy

RetroGreen Energy

4.76(
41
)

RetroGreen Energy

4.76(
41
)
Customers say: Super punctual
Recommended by 97% of Angi customers
Recommended by 97% of HomeAdvisor customers

All of our home energy auditors are BPI certified. All of our installers are BPI certified company employees. We have great specials and financing available.

"The crew arrived right on time and immediately set to work. The foreman went through the house with his infrared camera to find the locations of studs and blocks (boards between studs) and gave measurements to another guy outside, who marked these locations with black tape. Then they drilled holes into each cavity from outside (5/8" holes through the stucco). That was quite a noisy operation! Once the holes where drilled, they began filling with the foam from outside. One person was inside to see if the foam started to come through the inside. (We had one spot where a kitchen cabinet was built right up to the outside -- 100 year old house -- and they started to run the insulation into the cabinet! Quickly stopped and easily cleaned up.) They used drop-cloths outside to collect most of the excess foam (see photo) and did a pretty good job of cleaning up. They filled the holes and touched up with the paint we provided. I admit I was worried about having a lot of obvious patches showing up on the walls outside, but you really cannot tell unless you look quite close... except for a few areas where the wall is dirty. Those should disappear when I do a little wall washing this summer. Our drafty, 100-year-old house is much less drafty, definitely cozier, and noticeably quieter (the foam-filled walls deaden a lot of noise.) Looking forward to seeing how it effects my energy bill! The two photos show the back of the house during the job (see black tape and lines of foam between holes) and after (all cleaned up; patched holes not easy to spot.) I should note that this was all done in one snowy, 30 degree day."

BRUCE Y on April 2018

All of our home energy auditors are BPI certified. All of our installers are BPI certified company employees. We have great specials and financing available.

"The crew arrived right on time and immediately set to work. The foreman went through the house with his infrared camera to find the locations of studs and blocks (boards between studs) and gave measurements to another guy outside, who marked these locations with black tape. Then they drilled holes into each cavity from outside (5/8" holes through the stucco). That was quite a noisy operation! Once the holes where drilled, they began filling with the foam from outside. One person was inside to see if the foam started to come through the inside. (We had one spot where a kitchen cabinet was built right up to the outside -- 100 year old house -- and they started to run the insulation into the cabinet! Quickly stopped and easily cleaned up.) They used drop-cloths outside to collect most of the excess foam (see photo) and did a pretty good job of cleaning up. They filled the holes and touched up with the paint we provided. I admit I was worried about having a lot of obvious patches showing up on the walls outside, but you really cannot tell unless you look quite close... except for a few areas where the wall is dirty. Those should disappear when I do a little wall washing this summer. Our drafty, 100-year-old house is much less drafty, definitely cozier, and noticeably quieter (the foam-filled walls deaden a lot of noise.) Looking forward to seeing how it effects my energy bill! The two photos show the back of the house during the job (see black tape and lines of foam between holes) and after (all cleaned up; patched holes not easy to spot.) I should note that this was all done in one snowy, 30 degree day."

BRUCE Y on April 2018

Avatar for Solar Wolf Energy

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 Energy Choice Center

Energy Choice Center

No reviews yet

Energy Choice Center

No reviews yet
16 years of experience

We provide free energy consulting services that pertain to discounted natural gas and electricity supply services through local utility companies.

We provide free energy consulting services that pertain to discounted natural gas and electricity supply services through local utility companies.

Avatar for Innovative Dr. Energy Saver

Innovative Dr. Energy Saver

No reviews yet

Innovative Dr. Energy Saver

No reviews yet
20 years of experience

Innovative Dr. Energy Saver is a division of Innovative Basement Systems. We have been in business since 2005, serving all of the local areas needs in Minnesota for basement waterproofing, foundation repair and basement finishing. For 10 years, the business has enjoyed steady and continued growth with many awards received and continued excellent A+ standing with the BBB. As an important member of Basement Systems and Foundation Supportworks international networks of waterproofing and foundation repair contractors, we were recently honored with 7 awards at the Team Basement Systems International Convention.

Innovative Dr. Energy Saver is a division of Innovative Basement Systems. We have been in business since 2005, serving all of the local areas needs in Minnesota for basement waterproofing, foundation repair and basement finishing. For 10 years, the business has enjoyed steady and continued growth with many awards received and continued excellent A+ standing with the BBB. As an important member of Basement Systems and Foundation Supportworks international networks of waterproofing and foundation repair contractors, we were recently honored with 7 awards at the Team Basement Systems International Convention.

Avatar for USA Alarm Service, Inc

USA Alarm Service, Inc

No reviews yet

USA Alarm Service, Inc

No reviews yet
29 years of experience

USA Alarm is a national company that has more than two decades of experience and an award winning command center that protects more than 700,000 homes and businesses through the United States, 24 hours a day and 7 days a week. We have offices located throughout the US, with two main offices in Indianapolis, Indiana and Post Falls, Idaho.

USA Alarm is a national company that has more than two decades of experience and an award winning command center that protects more than 700,000 homes and businesses through the United States, 24 hours a day and 7 days a week. We have offices located throughout the US, with two main offices in Indianapolis, Indiana and Post Falls, Idaho.

Energy Efficiency Auditing questions, answered by experts

DIY is possible with basic tools. Professional audits provide comprehensive assessments and tailored recommendations.

Generator size requirements vary wildly among properties, but typical generator sizes are listed below based on home square footage:

  • 1,000 sq ft: 6–9 kW

  • 1,500 sq ft: 7–10 kW

  • 2,000 sq ft: 10–14kW

  • 2,500 sq ft: 12–16kW

  • 3,000 sq ft: 16–20kW+

Unfortunately, home square footage isn’t always a good indicator of generator size requirements. Instead, you should call in a professional to discuss which items in your home you’d like to run via your generator. They can calculate peak and average consumption for those items and then size your generator appropriately for optimal performance.

Yes, installing an attic fan can help lower your electric bill—particularly if you live in a hot and humid region. By replacing hot and stuffy air with cooler air, these fans help regulate the temperature in your attic and the rest of your home, taking some of the pressure off of your air conditioner.

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, these services often increase home value by preventing moisture-related issues and enhancing the usable space in basements or crawlspaces.

The Willmar, MN 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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