The visible transmittance (VT) rating indicates how much light passes through the glass, with higher numbers indicating greater light transmission.

glass that has been processed and treated to increase its break resistance

a measure of how well a window blocks heat gain from solar radiation. The rating ranges from 0 to 1, with lower numbers indicating better heat resistance.

A single-hung window looks much like a double-hung window, but only the bottom sash is operable, while the top sash is fixed in place.

R-value measures a substance's resistance to the flow of heat. It's most commonly used when discussing insulation products but is useful to understand when looking at windows because it' [..]

a window that doesn’t open. The term picture window is sometimes used as a synonym.

a window that has sashes that open from both the top and the bottom

windows made from two or more materials. Common examples include fiberglass composites (fiberglass-reinforced polymer windows) and wood composites, which come from combinations of materials such as wo [..]

Condensation-resistance ratings provide an indication of the likelihood that water vapor will form on the inside glass of a given window product. It's rated on a scale of 0 to 100, with higher nu [..]

a side-hinged window that swings outward to open