Illinois Energy Windows & Siding has sold and installed Worthngton Windows since since 1993. Our windows 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.


Our Cedar Ridge Insulated Siding is fused with a backing of contoured insulation to reduce energy loss and help straighten imperfect walls. Our insulated, composite wall systems are engineered with superior features that enhance the siding’s beauty and protect it no matter what Mother Nature has in store.


CastleView Entry Systems offer an outstanding combination of energy efficiency, security, durability, and low-maintenance beauty. Every CastleView Entry System component comes with one feature you can’t see. That’s durability. From the inside out, every CastleView Entry System is built to offer long service life.