How do I know if a window is energy efficient?

• <div><p>Energy-efficient windows are judged on their performance according to a few different factors, including heat transfer, air leakage, light transference, and condensation resistance. If you're unsure whether a window is energy-efficient, look for an ENERGY STAR® label from the <a href="https://www.energystar.gov/">U.S. Environmental Protection Agency (EPA)</a>. If various products, including windows, meet energy-efficiency standards set by the federal government, the EPA issues this label to help consumers identify energy-efficient products.</p></div>

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TRUSTED BY DEFOREST, WI HOMEOWNERS

4.7
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98
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Verified Reviews for Window Service pros in Deforest, WI

*The Angi rating for Window Service companies in Deforest, WI is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Window Service needs.

*The HomeAdvisor rating for Window Service companies in Deforest, WI is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Window Service needs.

Last update on October 08, 2025

Reviewed in May 2024
The Window Store did such an amazing job on our kitchen reface and cabinet inserts project. From start to finish, everything went smoothly and every promise was delivered. The project was finished within the timeline we were given and the installation went smoothly. Everyone we worked with at...
The Window Store
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Reviewed in May 2023
I highly recommend Capital City Window Experts! I had my upstairs windows replaced and I love my new windows. Timely and efficient, CCWE is a local business I will continue to support. I could not be happier!
Capital City Window Experts
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Reviewed in May 2023
My husband and I purchased a house recently and a few of our current windows had dry rot and our sliding door was in horrible shape. The day we closed on our house we had Mad City come out for a quote to replace 2 windows and our sliding door. The sales guy even check another window that needed...
Mad City Windows & Baths
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Reviewed in April 2020
Brian is always punctual, professional and does a great job. We had some tough stains on the basement windows (from the sprinkler system) and they came out great. We will certainly continue to use Brian in the future.
BRIGHT VIEW WINDOW CLEANING
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Reviewed in October 2017
The windows are fine. The installation crew was on time for the day the work was scheduled however they did damage to the surrounding drywall and the painted interior walls. When I prompted the company with my complaint I was told that they did not believe they did damage and would consider...
ABC Seamless Home Specialists
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Reviewed in April 2012
I have had Thebco windows installed in my last two homes. The quality of the windows and the installation was superb. The office staff and sales professionals have been easy to work with, honest, timely, and responsive to my concerns. Being self-employed, I have always had to do my projects...
THEBCO Windows, Doors & Siding
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Reviewed in December 2011
I left for work and between when I left and when I returned, he installed my large front window to replace one with a broken seal and rotting woodwork. When I returned, the window was installed - so no cold night for me! The next day he finished all of the trim. So I had no inconvenience, a good...
G.S. Construction Services
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Reviewed in December 2010
Fantastic! I had several estimates done and Waunakee was the only one who would quote the full job (18 windows) and the partial job (10 windows). We decided to do the partial job (upstairs and utility room). I went by the store front on Odana and the lady there couldn't be nicer. They set me up...
Waunakee Remodeling
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Windows questions, answered by experts

In most cases, it's worth it to install hurricane windows—especially if you live in an area prone to hurricanes and storms. Hurricane windows not only protect your windows from breaking but also protect the interior of your home from storm damage while also potentially reducing your homeowner's insurance premium. On top of that, hurricane windows have an ROI of 80% to 85%.

Consider energy performance ratings, durability, aesthetics, and ease of maintenance when selecting windows for different environments.

Energy-efficient windows are judged on their performance according to a few different factors, including heat transfer, air leakage, light transference, and condensation resistance. If you're unsure whether a window is energy-efficient, look for an ENERGY STAR® label from the U.S. Environmental Protection Agency (EPA). If various products, including windows, meet energy-efficiency standards set by the federal government, the EPA issues this label to help consumers identify energy-efficient products.

Clean glass regularly, lubricate moving parts, and inspect seals for leaks.

Smart windows can last anywhere from 10 to 50 years. It depends on the type and brand of smart window you choose and how much usage your windows get.

By submitting this question, I acknowledge and agree that Angi may publicly display my name, city, state, and question on the website for professionals and others to see.

The Deforest, WI homeowners’ guide to window services

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

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