The EcoExcel™ package guarantees you'll get the top Andersen energy-saving features and qualify for the tax credit*. By combining the most innovative glass technologies with our exclusive Perma-Shield® cladding, Andersen® 400 Series windows and patio doors are up to 70% more energy-efficient than brands with ordinary dual-pane glass1.
- SmartSun™ glass technology lets the sunshine in, keeps heat build-up out and blocks 95% of harmful ultraviolet (UV) rays that can damage fabrics and cause colors to fade.
- Low-E4® glass coating is the new standard for high performance and low-maintenance. It stays clean longer than ordinary glass and eliminates up to 99% of water spots.2
- Exclusive exterior Perma-Shield® system gives Andersen windows and doors a tough protective shell that safeguards the wood inside. This exclusive vinyl cladding repels water, resists dents and blocks the transfer of heat hundreds of times better than aluminum cladding. Best of all, it looks great and never needs painting.
Andersen windows and doors with the EcoExcel™ package exceed Energy Star® criteria for every climate zone in the United States.
Qualifying Windows/Doors
More styles, sizes and shapes of windows and doors that meet energy requirements.
View Manufacturer's Certification Statements 
View windows and patio doors with the EcoExcel™ package and other qualifying products
Tax Credit Details
Economic Stimulus Energy Tax Credit
Upgrade to energy-efficient windows and doors. Get the 2009 and 2010 Energy.
Learn More
*See the Andersen Manufacturer’s Certification Statement for a list of products in Andersen’s EcoExcel™ package and other products that meet the eligibility requirements for the tax credit under Section 25C of the Internal Revenue Code as amended by the American Recovery and Reinvestment Act of 2009. Andersen bears no responsibility for validating or obtaining the tax credit and expressly disclaims any responsibility for determining whether a particular purchase or application qualifies for the tax credit. Further, Andersen does not intend to and is not providing legal or tax advice and recommends that purchasers consult their own tax advisor or the IRS to determine whether the products they purchase for a particular application qualify for the tax credit. “Andersen” and all other marks where denoted are trademarks of Andersen Corporation. © 2009 Andersen Corporation. All rights reserved.
1- Values are based on a comparison of an Andersen 400 Series tilt-wash double-hung window with SmartSun glass in summer U-Factor and SHGC to the U-Factor and SHGC for clear dual pane glass, non-metal frame default values from the 2006 International Energy Conservation Code (IECC) and vary by season. 2- Exterior pane, when activated by sunlight. 3- National average reported in Remodeling magazine's cost vs. value report 2009-2010.
