Energy Star Program
Learn how to identify windows and doors that will provide the best energy efficiency and savings for your home.
The ENERGY STAR program for windows divides the country into four distinct climate zones to recognize the varying heating and cooling months among the states. For patio doors, there is only one U-Factor and one Solar Heat Gain Coefficient (SHGC) requirement for Energy Star compliance.
Please consult your contractor or a Lowe’s store associate for specific thermal properties that vary based on glass options and grid choices, and verify your window’s actual performance to ensure Energy Star rating in your specific climate zone.
Learn more about the ENERGY STAR program by visiting their website at www.energystar.gov.
Awarded the ENERGY STAR Most Efficient Recognition in 2023
The ENERGY STAR Most Efficient 2023 designation recognizes the most efficient products among those that qualify for the ENERGY STAR program. RELIABILT Series 3900 windows represent the leading edge in energy efficient products this year.
Window Criteria
The chart to the right provides U-Factor and Solar Heat Gain Coefficient (SHGC) values used to determine if a window meets ENERGY STAR requirements for a given climate zone.
Door Criteria
The chart to the right provides U-Factor and Solar Heat Gain Coefficient (SHGC) values used to determine if a door meets ENERGY STAR requirements for a given climate zone.
Low-E and Argon Gas
Learn how Low-E coatings on glass and argon gas filled between glass panes reduces energy usage and improves the year-round comfort of your home.
Understanding Condensation
Learn more about the causes of condensation on windows in your home, as well as ways to reduce or eliminate it.
Energy Tax Credit
Learn more about the 2021 Energy Tax Credit extension and download the RELIABILT Manufacturer’s Certification Statement.
Energy Efficient Glass
With multiple glass options to increase energy efficiency, there is a glass package to fit any climate need and budget. Visit the Glass section of our site to learn more about available options and energy efficiency.
Windows 101 Videos
In this section you find a collection of educational videos covering a wide range of topics. Each short video is dedicated to a specific Windows 101 topic of interest.