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Double Hung
Sliding Window
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Bay Window
Bow Window
Garden Window

Energy Efficiency

Built right for added strength. Thermal King windows are entirely fusion welded - both sashes and mainframes use this advanced manufacturing method. Unlike windows that use staples, screws or caulk to hold their window frame corners together, Thermal King welds vinyl sections together to create a solid one-piece unit that won't come loose or weaken over the years.

New Generation™ Vinyl for maintenance freedom. Every Thermal King window is constructed with rugged maintenance-free uiPVC(polyvinyl chloride). Thermal King New Generation Vinyl windows will never stick like wood or metal windows because they don't sweat or deteriorate from corrosion, pitting or rot. Wash them with soap and water and they'll look great year-after-year. We also utilize the highest quality locking and operating hardware available. Our windows also feature E-Gard ™ hardware, which is chemical, corrosion and ultra-violet resistant.

Built tight to keep air out. Air infiltration is a major cause of energy loss. Thermal King sashes feature heavy-duty weatherstripping and double-hung and sliding windows feature full meeting rail interlocks. This method of construction creates a double barrier to air and water. Guaranteed For Life Thermal King believes so strongly in the durability of its products that it offers a limited lifetime warranty on the entire window unit - and it's transferable. In addition, Thermal King windows are backed by a lifetime non-prorated seal failure and glass breakage warranty.

Thermal King windows…good for you, good for your home and good for the environment.