A Long History Of Quality
The Custom Shield Window partnership is to provide the highest quality of wood replacement windows and doors.The products offer the most wood species options in the industry, best installation practices, longest performance, and most comprehensive warranties that exist. The factory, Weathershield, has built beautifully handcrafted windows since 1955 and is one of largest window companies in the world. Illinois Energy Windows and Siding has provided tens of thousands of customers throughout Chicagoland with installation craftsmanship, service, and local expertise since 1993. The combination results in the highest quality, performance, and warranty for premium wood windows and doors in Chicagoland.



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