Contact Us

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Energy Efficient Windows and Doors


Energy Efficiency Certifications

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.


Which glass performance factors should I evaluate?

  • 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.

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 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 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

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

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.

The Most Energy Efficient Windows

What does it mean to be an ENERGY STAR certified window or door?

To obtain ENERGY STAR certification, a window or door must meet a set of requirements that are determined by the U.S. government. Those requirements differ based on geography, meaning a window that's being installed in Minnesota has different requirements than one in Georgia. The certification is meant to indicate that the window is energy-efficient in the region where it will be used, and can help homeowners save on energy costs.

Does my window need to be ENERGY STAR certified to be energy efficient?

No. While an ENERGY STAR label helps identify energy-efficient windows, every home is different. ENERGY STAR provides a one-size-fits-all guideline but does not take into consideration all the factors that make your home unique.

Infinity combines our ULTREX® frame with high-performing glass options for beautiful and energy-efficient windows and doors. ULTREX® is far less thermally conductive than aluminum (5000x less) and insulates much like wood. This means that Ultrex provides an insulating barrier against extreme weather temperatures, keeping your home comfortable and helping to reduce heating and cooling costs.

How do I know which glass option makes the most sense for my home?

When you are comparing window glass options, keep the following in mind:

  • A "good" U-factor is <.30
  • A "good" SHGC depends upon your climate
  • If you live in a colder climate, you'll generally want a replacement window with a low U-Factor and higher SHGC
  • Generally, you'll want a lower SHGC if you live in a warmer climate with intense sun

Get Options, Ideas and Prices
Schedule a Free In-House Consultation

Ask a question, or schedule a free, highly informative in-home consultation.
Your information will not be shared with any third parties. Serving San Diego County - Los Angeles County - Orange County - Riverside County - San Bernardino County

Contact Us

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

or Give Us A Call at:(800) 490-5041



✔ NO Payment ✔ NO Interest ✔ for 2 Years.

Contact Us

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.