$1000 Off Whole House Window Replacement. BONUS: 18 Months No Interest Financing!

Refresh Your Home With WINDOWS & DOORS From Andersen

 Andersen Corporation is the largest window and door manufacturer in North America. Founded in 1903, Andersen is an international corporation employing more than 11,000 people in locations across North America, with sales worldwide. 

FREE No Obligation Estimates

Only The Best From Andersen!


Huge Savings On Andersen Windows & Doors

Energy Efficient Replacements LLC is the areas leading Andersen Installation Dealer. Our team of experts is ready to help design your project today. Enjoy the beauty of new Andersen Windows & Doors.


Andersen 400 - Stylish, Refined And Proven

As our most popular series with our longest-standing products, the 400 Series brings you the best overall blend of performance and style to satisfy just about any window or door need. With years of engineering and craftsmanship to build on, these windows are designed to live up to your high standards. 


400 Series Frenchwood® Gliding Patio Door

Gliding patio doors have at least one door panel that glides smoothly past another door panel to save room where you need it—inside or out. With their wide wood profiles, Andersen® 400 Series Frenchwood® gliding patio doors give your home the old-world character of traditional French doors along with the convenience and space savings no hinged door can provide. And, because they’re Andersen patio doors, they’re just as effective in sealing drafts and moisture out of your home. 

Popular Window Styles

Double Hung Windows


 Double-hung windows have two operating sash that move up and down allowing for ventilation on the top, bottom or both. 

Gliding Windows


Andersen gliding windows have a sash that glides horizontally to allow for ventilation. 

Casment Windows


Casement windows are hinged on the side, with the sash opening horizontally. This allows for full ventilation from top to bottom of the window opening.

Why Are We The Best Choice?

Factory Trained Craftsmen


You Only Get The Best Quaity Workmanship.

Customer Service


We are with you every step of the way. Need help after the sale? We are here for you!

Best Warranty


We Give A Warranty On The Workmanship Of All Products We Install.

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18 Months No Interest Financing

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Energy Efficient Replacements LLC

51285 Bittersweet Road, Granger, Indiana 46530, United States


Office Hours

Monday - Thursday: 9am - 5pm

Friday: 9am - 3pm

Saturday: By appointment

Sunday: By appointment