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Verified Reviews for Energy Efficiency Auditing pros in Williams Bay, WI
*The Angi rating for Energy Efficiency Auditing companies in Williams Bay, WI 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 Williams Bay, WI 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 November 02, 2025
Find Energy efficiency auditors in Williams Bay

Daniel Nagel
Daniel Nagel
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

USA Alarm Service, Inc
USA Alarm Service, Inc
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.
Solar Wolf Energy
Solar Wolf Energy
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!

Gray Electric LLC
Gray Electric LLC
Proudly serving both Mauston and Tomah and the area for over 50 years as a family owned and operated business, Gray Electric is the leading residential and commercial, and industrial electrical service provider in the region. Not only can we address any electrical service needs, we’ll provide you with a variety of options so you can choose which one works best for you! We handle projects of any size, from residential repairs to rewiring entire factories. Our employees are skilled at their craft, have apprenticed with master electricians, take continuing education courses, and regularly attend seminars. The main goal of Gray Electric for has always been quality customer service. That goal has been attained with the professional, competent, and caring employees.
"Great, the electrician showed up on time, replaced the box and put a new cover on, and he even swept up his mess and wiped the floor up with a paper towel! Would recommend to any of my friends and family!"
Myles C on February 2019
Proudly serving both Mauston and Tomah and the area for over 50 years as a family owned and operated business, Gray Electric is the leading residential and commercial, and industrial electrical service provider in the region. Not only can we address any electrical service needs, we’ll provide you with a variety of options so you can choose which one works best for you! We handle projects of any size, from residential repairs to rewiring entire factories. Our employees are skilled at their craft, have apprenticed with master electricians, take continuing education courses, and regularly attend seminars. The main goal of Gray Electric for has always been quality customer service. That goal has been attained with the professional, competent, and caring employees.
"Great, the electrician showed up on time, replaced the box and put a new cover on, and he even swept up his mess and wiped the floor up with a paper towel! Would recommend to any of my friends and family!"
Myles C on February 2019
Next Energy Solution Inc.
Next Energy Solution Inc.
Next Energy Solution Inc. is a Pioneer in the Solar Electric Industry with Pre Engineered Plug N Play Solar Electric Systems. We contract with Electrical design engineers throughout North America to bring the best possbile solution for the customer. We prescreen our contracting partners to ensure they are properly Licensed and Insured and trained, giving our customer a good experience and willingness to refer NES to the friends. NES offers No Money Down Financing program up to $40,000. NES is AG Star approved vendor of Solar Electric Systems for Agriculture NES has specially designed easy to install Plug N Play Solar kits with a 25 Year performance Warranty.
"It did not. After paying a down payment and submitting all paperwork the array was not installed. From my experience I cannot recommend this company."
Shane B on August 2018
Next Energy Solution Inc. is a Pioneer in the Solar Electric Industry with Pre Engineered Plug N Play Solar Electric Systems. We contract with Electrical design engineers throughout North America to bring the best possbile solution for the customer. We prescreen our contracting partners to ensure they are properly Licensed and Insured and trained, giving our customer a good experience and willingness to refer NES to the friends. NES offers No Money Down Financing program up to $40,000. NES is AG Star approved vendor of Solar Electric Systems for Agriculture NES has specially designed easy to install Plug N Play Solar kits with a 25 Year performance Warranty.
"It did not. After paying a down payment and submitting all paperwork the array was not installed. From my experience I cannot recommend this company."
Shane B on August 2018
Cool House Duct Doctor
Cool House Duct Doctor
I am a Certified Air Duct Cleaning Specialist At Cool House Duct Doctor our mission is to provide our customers,"you", with the best Indoor Air Quality and Energy Efficiency *Services so you can breathe better air inside your home or office while immediately reducing your energy bills. We at Cool House do this by offering; *dryer vent cleaning, which also reduces your risk of fire, *duct cleaning & *duct sealing, that will improve circulation and air flow of your conditioned air also, reducing the air draw from non filtered area's like attic spaces, crawl spaces or even leaking doors and windows. *Anti-microbial treatment, Good for Commercial, Industrial, Residential and Institutional applications. Anti-microbial treatment is ; *Bacteriostat *Fungistat *Deodorizer destroying odors associated with bacteria, mold, mildew, smoke, animals, etc. Cool House also installs *radiant barrier in your attic and *blown attic insulation reducing the energy bills you pay so that you may keep more of your hard earned money in this time of skyrocketing energy costs! The Cool House Duct Doctor strives to make your home and office a more comfortable place to live.
I am a Certified Air Duct Cleaning Specialist At Cool House Duct Doctor our mission is to provide our customers,"you", with the best Indoor Air Quality and Energy Efficiency *Services so you can breathe better air inside your home or office while immediately reducing your energy bills. We at Cool House do this by offering; *dryer vent cleaning, which also reduces your risk of fire, *duct cleaning & *duct sealing, that will improve circulation and air flow of your conditioned air also, reducing the air draw from non filtered area's like attic spaces, crawl spaces or even leaking doors and windows. *Anti-microbial treatment, Good for Commercial, Industrial, Residential and Institutional applications. Anti-microbial treatment is ; *Bacteriostat *Fungistat *Deodorizer destroying odors associated with bacteria, mold, mildew, smoke, animals, etc. Cool House also installs *radiant barrier in your attic and *blown attic insulation reducing the energy bills you pay so that you may keep more of your hard earned money in this time of skyrocketing energy costs! The Cool House Duct Doctor strives to make your home and office a more comfortable place to live.
Wisconsin Roofing Systems
Wisconsin Roofing Systems
We are a family owned business with over 20 years of construction experience. With over 500 steel roofs installed we have the knowledge to complete your job right the first time and on budget. We specialize in lifetime stone coated steel roofing systems but also offer asphalt, standing seam, ribbed steel and flat roofing options. Looking for one stop to complete all your home remodeling? We have completed hundred of projects involving windows, doors, siding and just about any other thing you can think of. Based in Stevens Point we cover most of Wisconsin and are sure to have a completed job nearby you!
We are a family owned business with over 20 years of construction experience. With over 500 steel roofs installed we have the knowledge to complete your job right the first time and on budget. We specialize in lifetime stone coated steel roofing systems but also offer asphalt, standing seam, ribbed steel and flat roofing options. Looking for one stop to complete all your home remodeling? We have completed hundred of projects involving windows, doors, siding and just about any other thing you can think of. Based in Stevens Point we cover most of Wisconsin and are sure to have a completed job nearby you!

Dowe and Wagner, Inc.
Dowe and Wagner, Inc.
Heating, Ventilation & Air Conditioning Services for seventy eight years, Dowe and Wagner, Inc. have provided Southeastern Wisconsin’s & Northeastern Illinois’s residential and commercial HVAC customers with all season, in-door comfort. We maintain and repair all makes & models. Our Reputation When you ask our customers about us, we are confident you will be pleasantly surprised with their answers. We work hard to keep our customers happy. We provide referrals upon request. We have many sources at our disposal to obtain any part of your heating and cooling needs. We will stop at nothing to get proper parts to repair your system. Experience, We keep our servicemen up-to-date on the latest changes in the industry through regular schooling. Our technicians average 40 hours per year of industry training. This translates to less errors in diagnosing any needed repairs. Dependability, we go out of our way to insure that your heating and cooling problems are tracked down and repaired as soon as humanly possible. Reliability, We follow the strictest practice standards set by Bryant and have the position of Factory Authorized Dealer. Concern, No one enjoys an unexpected breakdown. We offer both preventative maintenance and full service agreements to insure that your equipment is operating at its peak efficiency. Energy Conservation We believe you should enjoy your system’s full efficiency at the lowest cost possible, so our sales staff is trained to choose the proper size of equipment for every job.
"We had a 20+ year old furnace that finally gave out on us. The technician, Ted, who replaced the furnace was very nice, respectful, and efficient. We had the new unit installed and running that same day! Very pleased and would highly recommend this company."
Nathaniel H on December 2023
Heating, Ventilation & Air Conditioning Services for seventy eight years, Dowe and Wagner, Inc. have provided Southeastern Wisconsin’s & Northeastern Illinois’s residential and commercial HVAC customers with all season, in-door comfort. We maintain and repair all makes & models. Our Reputation When you ask our customers about us, we are confident you will be pleasantly surprised with their answers. We work hard to keep our customers happy. We provide referrals upon request. We have many sources at our disposal to obtain any part of your heating and cooling needs. We will stop at nothing to get proper parts to repair your system. Experience, We keep our servicemen up-to-date on the latest changes in the industry through regular schooling. Our technicians average 40 hours per year of industry training. This translates to less errors in diagnosing any needed repairs. Dependability, we go out of our way to insure that your heating and cooling problems are tracked down and repaired as soon as humanly possible. Reliability, We follow the strictest practice standards set by Bryant and have the position of Factory Authorized Dealer. Concern, No one enjoys an unexpected breakdown. We offer both preventative maintenance and full service agreements to insure that your equipment is operating at its peak efficiency. Energy Conservation We believe you should enjoy your system’s full efficiency at the lowest cost possible, so our sales staff is trained to choose the proper size of equipment for every job.
"We had a 20+ year old furnace that finally gave out on us. The technician, Ted, who replaced the furnace was very nice, respectful, and efficient. We had the new unit installed and running that same day! Very pleased and would highly recommend this company."
Nathaniel H on December 2023

Energy Choice Center
Energy Choice Center
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.
The Williams Bay, WI 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.

Find out where homeowners spend the least and the most on house utilities like water, electricity, internet, cable, and natural gas.

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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