Energy Efficient Replacement Windows & Doors

A leader in Energy Star qualified replacement windows and doors, Infinity can help improve your home's comfort. Learn about our energy-efficient replacement windows and doors.

Energy Efficiency

Energy Efficient Windows and Doors

We submit Infinity windows and doors for independent testing and verification to achieve energy certification and labeling in programs administered by the National Fenestration Rating Council (NFRC) and ENERGY STAR®. Use the NFRC label to compare energy performance factors across products and brands.
Tax credit programs change often. To stay up-to-date with the latest, visit Here is a link to the Infinity Manufacturers’ Certification Statement.


Energy Efficient Window Glass Performance

  • U-Factor: U-factor measures how well a window keeps heat inside your home. A higher number allows more heat to escape; a lower number allows less heat to escape. If you live in a colder climate, you’ll want to look for a low U-factor.
  • Solar Heat Gain (SHGC): The Solar Heat Gain Coefficient (SHGC) measures how much heat from the sun enters your home. The lower the number, the less heat the window lets in. You’ll want a lower SHGC if you have high cooling costs in the summer; a higher SHGC can help warm a home in a colder climate during the winter.
  • Visible Transmittance (VT): Visible Transmittance measures the amount of visible light that passes through a window. A high VT maximizes daylight.
Glazing Options

Low E insulating glass coatings

Extremely thin coatings of special low emissivity (Low E) metallic material are applied to glass panes used in windows and doors to boost their energy efficiency and block out UV rays. Low E coatings are typically applied to the inside layers of insulating glass to manage the amount of light and heat transmitted through a window. A window with Low E coating can reject solar heat gain without reducing visible light. Since glass choice plays a big factor in window and door efficiency, your local Infinity partner can provide recommendations on the best selection for your home.

Low E1
Low E1

Low U-Factor
High solar heat gain

Primarily used in colder climates, Low E1 allows more heat in to warm a room while blocking heat loss. Achieve maximum benefits when used on elevations with direct sun exposure. Low E1 has one layer of metallic coating.

Low E2
Low E2

Low U-Factor
Medium solar heat gain

Low E2 offers year-round performance in moderate climates. It will help retain heat in your home during the winter and keep heat out during the summer. Low E2 has two layers of metallic coating. It also blocks 84% of the sun's UV rays to reduce fading.

Low E3
Low E3

Lower U-Factor
Lower solar heat gain

Low E3 rejects solar heat while letting light in, resulting in increased performance in climates with intense sun exposure. Low E3 has three layers of metallic coating. It also blocks up to 95% of the sun's damaging UV rays.

Low E3/ERS
Low E3-ERS Snowflake Low E3-ERS Sun

Superior U-Factor
Lower solar heat gain

With an extra metallic layer on the room-side glass to reflect escaping heat back into the room, Low E3/ERS provides maximum efficiency year-round in all conditions. Low E3/ERS has four layers of metallic coating.



Frequently asked energy efficiency questions

Discover what Infinity can do for you

A local Infinity partner can help you determine the right mix of window and glass options to find an energy-efficient solution for your home.

Schedule Now