Why Gentek?

Gentek is one of Canada's most trusted manufacturers of vinyl windows and patio doors, with a reputation for quality construction, energy efficiency, and lasting performance in the Canadian climate. As an authorized Gentek dealer, City Window & Glass supplies the full Gentek residential product line at competitive rates for handymen, contractors, and DIY homeowners.

Window Styles Available

Casement, awning, single hung, double hung, single slider, double slider, picture windows, bay and bow windows, and architectural shapes. All styles are custom-sized to your exact opening dimensions.

Patio Door Options

Gentek sliding patio doors are available in 5-foot, 6-foot, and 8-foot widths, in two-panel or three-panel configurations, with optional integrated screens, mini-blinds between the glass, and a range of hardware finishes.

Energy Efficiency Standard

Every Gentek window and patio door we supply comes standard with three energy-efficiency upgrades that are often extra-cost options with other manufacturers:

Warm-Edge Spacers — reduce heat conductivity by 75% compared to aluminum spacers

Low-E Glass Coating — reflects radiant heat back inside in winter, blocks solar heat in summer

Argon Gas Fill — an inert gas between panes that insulates better than air and blocks more UV

Together, these features make Gentek windows more than twice as energy-efficient as older double-glazed windows and qualify them for ENERGY STAR® certification.

Ordering Notes

Because these are supply-only, please double-check all measurements before ordering. Once a custom window has been manufactured, its size cannot be changed. We provide installation guidelines and are happy to answer questions about fit and finish — just call or email before you order.