The Worthington Window®. Superior Energy Performance & Value.

Manufactured with Value in Mind, Worthington Windows® will provide you years of trouble free performance. All Worthington Windows® are backed by the industries most comprehensive warranty, TRUE-LIFETIME WARRANTY. This covers everything from start to finish = 100% on parts, pieces, installation, and seal, its guaranteed!

Superior Energy Performance.

Worthington Windows® are built with the highest commitment towards energy efficiency. With the huge increases in heating and cooling homes, now and in the future, our Custom Process gives the highest savings to you. With over 100,000 replacement windows installed over the years, we have saved Homeowners over $25,000,000 in energy savings alone.

Worthington Windows.

Illinois Energy Windows & Siding has sold and installed Worthngton Windows since since 1993. Our window are built and installed with the highest commitment towards quality, beauty, ease of maintenance, performance, and customer care, exclusively for Illinois Energy customers in Illinois.

QuadraSeal™

With the worlds most advanced thermal insulating sealing system, the QuadraSeal System provides the highest energy savings and performance. This gives you day after day, year after year, performance. The results are maximized energy savings and value. All sealed units are guaranteed against any seal failure, period. We replace most bad windows due to seal failure.