Windows, also referred to as glazing or fenestration, affect both how much daylight comes into a building and the building’s heating and cooling loads. The windows you choose, whether in a new build or a retrofit, can make a significant difference in your energy consumption—if properly employed, they can cut annual energy costs by up to 20% in perimeter zones.

In most large commercial buildings, cooling represents the major energy load, so you’ll want glazing that minimizes solar heat gain but doesn’t inhibit daylight. In buildings where heating is the major energy load, you’ll need to choose glazing that minimizes heat loss.

What are the options?
How to make the best choice
What’s on the horizon?
Who are the manufacturers?