High Performance Glass for Extreme Weather

Kas-Kel Energy Star Rated Glass Increases Energy Efficiency

Enhance Your Comfort 

block air leakage, eliminate cold air drafts, and maintain a comfortable inside temperature with limited risk of forming condensation or causing unnecessary extra energy cost

  • Our E III and ES U4 Version 7 Glazing Packages can lower the average home energy bill by 30 to 40 percent, and cut CO2 output by 1,600 pounds per year*.
  • Low e glass keeps your home warmer in the winter and cooler in the summer
  • Block Harmful UV rays while enjoying maximum light
  • Reduce street noise
  • Tints, Heat Reflection and other options available
Low E Glass Image

Glazing  Packages

The less energy lost and the more comfortable you feel near your window


*Available in Selected WIndow Styles Only
  • Our patented glazing system provides superior insulation from heat loss, returning an average annual savings of up to 40% on energy bills.*
low-emissivity coated glass – surfaces 2 & 4
Argon gas – between the panes

*Based on exterior replacement utilizing 16 windows. Savings are average and may vary according to home type and location.


  • Elevated level of solar heat control developed specifically for Northern regions
  • High visibility and light allowance without allowing harmful UV rays to pass through
  • Low reflective levels allow for clear views at all times of the day
  • Low-E coating protects your home from outside temperatures in every season
low-emissivity coated glass – surface 3
Argon gas – between the panes

ES U4 Version 7

  • Thermal insulation blocks solar rays, saving on energy costs year-round
  • Exceptional Visible Light Transmission (VLT) at 77% for abundant daylighting
  • Low reflective levels allow for clear indoor views at all times of the day
  • Low-E coating blocks outside temperatures and helps control indoor temps
low-emissivity coated glass – surfaces 2 & 4
Argon gas – between the panes

Superior Thermal Performance

  • Performance criteria for windows and skylights are based on ratings certified by the National Fenestration Rating Council (NFRC), and vary for each of the climate zones shown in the map above.

  • To find the climate in which you are located, search here.

Energy Star Map

Our Projects

Stunning projects for our amazing clients.