Energy Efficiency

Krestmark is proud to be an Energy Star® Partner, offering energy efficient options for windows and patio doors that not only help save on heating and cooling costs but can protect against fading and add to your overall comfort. 
Our energy efficient options include:

  • Multi chambered thermally superior, energy efficient vinyl frames and sash parts
  • 5/8” dual-pane insulated glass
  • ¾” dual-pane insulated glass
  • Triple pane insulated glass
  • Environsealed Windows (tm) using Duralite warm edge glass spacers improved performance,
  • Choose from a selection of glazing tints
  • Choose from several Cardinal LoE coatings to maximize the benefits for your particular needs and requirements
  • Argon enhanced glass improves energy efficiency

Energy Star®

Energy Star is a joint program of the U.S. Environmental Protection Agency and the U.S. Department of Energy helping us all save money and protect the environment through energy efficient products and practices.

Results are already adding up. Americans, with the help of Energy Star saved enough energy in 2008 alone to avoid greenhouse gas emissions equivalent to those from 29 million cars — all while saving $19 billion on their utility bills.

The Energy Star performance criteria for windows and doors is different depending on what region of the country the product is being used.  Below is the Energy Star climate map and corresponding requirements for each region.

Most Krestmark windows meet or exceed the strict Energy Star criteria for all regions when using appropriate options. 


Krestmark Energy Performance Data (.pdf)

Krestmark AAMA Performance Data (.pdf)

Mulling Oversize Units (.pdf)



Note: All picture windows, shapes and one-frame glass larger than 30 square feet will come with Tempered Glass as standard for safety reasons. All additional charges for Tempered Glass will automatically be applied.ditRegion4





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