American Thermal Energy Corporation

4.05 | 24 Verified Ratings


6926 West Beacher
West Allis, WI 53219
Your use of our services is governed by our Terms & Conditions

American Thermal Energy Corporation

Quality Home Improvements

When you select ATEC you can be assured that you will receive the best quality energy efficient windows, doors and siding at the lowest price. ATEC is locally owned and was founded on the idea that a customer should not have to decide between price and quality! We offer expert installation by a team of highly skilled, factory-trained professionals. Call us for a free estimate and expert advice on your energy efficient window, door and siding needs!

Services Offered

  • Exterior Doors Install
  • New Windows - Multiple

Service Area

  • Milwaukee
  • Racine
  • New Berlin
  • Brookfield
  • Waukesha
  • Menomonee Falls
  • Thiensville
  • West Bend
  • Jackson
  • Belgium
  • Slinger
  • Big Bend
  • Franklin
  • Fredonia
  • Hartford
  • Hubertus
  • Pewaukee
  • Sussex
  • Caledonia
  • Cedarburg
  • Elm Grove
  • Greendale
  • Lannon
  • Oak Creek
  • Richfield
  • Saukville
  • Waterford
  • South Milwaukee
  • Cudahy
  • Burlington
  • Germantown
  • Butler
  • Franksville
  • Grafton
  • Colgate
  • Muskego
  • See All >

Areas of Expertise

  • Energy efficient windows
  • Energy efficient doors
  • Energy efficient siding
  • Roofing systems
  • Gutters and gutter protection

Product Brands Used

  • We use the best brands available for your specific application.

Quick Facts

Business Hours
Monday - Friday 11:00 am - 8:00 pm
Saturday - Sunday 9:30 am - 1:30 pm
(Please call to confirm)
  • Warranty Offered
  • Credit Cards Accepted
  • Small Jobs Welcome
  • Materials
  • Free Estimates
  • Bilingual


In Business Since: 1995
Memberships & Affiliations
  • American Architectural Manufacturers Association (AAMA)
  • National Glass Association (NGA)
  • Steel Door Institute (SDI)
  • Window and Door Manufacturers Association (WDMA)
  • Energy Star Certified
  • Green Seal Certified
Green Certifications
  • - Home Performance with energy Star
  • Green Seal Certification -
  • NAHB - National Association of Home Builders Certified Green Professional
  • National Fenestration Rating Council -
  • Energy Star partner of the year 8 years in a row!
Type: General Liability
Amount: $2,000,000
Expiration: 06-01-2015
  • Recognized as one of the Top 200 remodelers in the United States!
HomeAdvisor Screened. View Details

Business Overview

Community Involvement

Involved in supporting our community in a variety of ways.

How We Got Started

I chose to work in this industry because I love helping people!.

I love working in Geographical Location because Reason You Enjoy Working There.

We started in this industry in 1989.

We describe our business as Family owned and operated


American Thermal Energy Corporation

3 photos   |  Here are some bay window pictures.
1 photo   |  Better Business Bureau Member

Ratings & Reviews
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American Thermal Energy Corporation

Real feedback from real homeowners.
Learn more about this pro by reading the ratings and reviews below.

Showing: 1-10 of 24 123Next

1.0   |  
Review by in Hales Corners, WI
Project: Window Repair
I had several windows installed by ATEC in 2008. In March I called to have two of our windows replaced because the seal had broken. They told me it would be about 2 - 3 weeks. I have left them messages at their 329-9373 number, but have never received a call back. I tried the email address I was given and received an email back that it was not a valid address. Yesterday I went to their Becher St. location and found that the building was for sale/lease and the sign said business relocating. If they are still in business, their customer service is horrible. I have no way to reach them.
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1.5   |  
Review by in Brown Deer, WI
Project: New Windows - Multiple
They replaced three window in the sunroom . The room was colder after the windows were replaced then before with the old windows.
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5.0   |  
Review by in Milwaukee, WI
The owner is a very caring person . Will use again in the future work I need done
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4.0   |  
Review by in West Allis, WI
Haven't had the work done yet, but very professional customer service.
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5.0   |  
Review by in Saint Francis, WI
Project: New Windows - Multiple
Excellent customer service. Great workmanship. We love our new windows and the price was reasonable.
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4.67   |  
Review by in Milwaukee, WI
Project: New Windows - Multiple
They were very nice about everything. Our budget was pretty low and with their help, we were able to get new windows. :)
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4.67   |  
Review by in Racine, WI
Project: New Window - Single
Company representatives in sales, business partner and customer service consistently courteous, friendly, responsive and knowledgeable. Window installer was careful with my personal property when he was inside. However, he did not clean up the scraps/debris to my satisfaction. It would have been better if they brought a small shop vac, etc. This was not a big enough complaint for me to voice a complaint to the company.
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2.5   |  
Review by in Sturtevant, WI
Project: New Window - Single
If you want to have a job done on not hire this company. Communication is extremely bad. Window had to be replaced 3 times before it was any good. Still waiting for molding..this project took nine months..The only good thing I can say is the men who put the window in did a good job. Promised a gift card for all inconvenience..still waiting...2 months ago.
Response by American Thermal Energy Corporation: Donna J. is right, the window did have to be replaced 3 times to get it right.The manufactureer of the window kept supplying us with a product that did not meet our standards. This was one of the big contributing factors to switching to a new supplier. We completely understand her frustration. However, we hope this situation shows our dedication to customer service. Unfortunately things don't always go as planncd but ATEC will do whatever they can to make it right!
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4.0   |  
Review by in New Berlin, WI
Project: New Windows - Multiple
ATEC was very professional about the installation and cleaned up everything! They even took the time to save my old windows & hardware for them & set them aside so I could sell them. Their customer service tends to be a bit pushy when they call about appointments and the like but it wasn't a major issue. Hence the reason 4 out of 5.
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5.0   |  
Review by in Milwaukee, WI
Great job - fast service
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Showing: 1-10 of 24 123Next

American Thermal Energy Corporation

4.05 | 24 Verified Ratings See All Reviews


6926 West Beacher
West Allis, WI 53219

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