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.
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.
Learn more about the causes of condensation on windows in your home, as well as ways to reduce or eliminate it.