4SEMO's premier brand of vinyl windows, Therma Lite, are built to last a lifetime, and have a warranty exactly that long — for life. That's a guarantee very few manufacturers will give, but that's why there are very few windows like ours. Therma Lite are Windows that Work!™

Why Glass is So Important
Since nearly 65 percent of a window's surface area is made up of glass, it's important to choose windows that carry insulated glass units. Think of insulated glass as a glass sandwich. And like a good sandwich, it's what's in the middle that counts. Therma Lite has incorporated the Swiggle™ Seal between the glass. With its warm edge technology, Swiggle™ Seal is the only proven product that has:

• documented superior performance in the retention of Argon Gas,
• the highest "R" value/lowest "U" value in the industry, and
• compatibility with the highest performance Low E glass.

Units are also available in bronze glass which has more tint to reduce glare or obscure glass, providing privacy without shades or blinds and is perfect for bathrooms or dressing areas. Most models are available in three great colors: snow white, earth brown (7000 Series and Hinged Patio Doors are available in White or Sand only).

Snow White

Earth Brown

Desert Sand

Series 7000 Single Hung Family Series 2900 Double Hung Family Series 4000 Casement Family Sliding Patio Doors Hinged Patio Doors Deluxe Garden Units