The Best Replacement Windows for Warm Climates

In warmer climates, the goal is to reduce the need for cooler air by protecting the indoors from warm summer days, and the heat and glare of sunlight. The U-factor is still important, as cool air should not be leaking through the window. In the south-central climate zone for example, a figure less than .35 would be fine. In the southern climate zone, Energy Star replacement windows can have a U-factor of up to .6.

SHGC is the most important figure in mild and warmer areas. It is important that the amount of heat, entering the home as sunlight, be minimal. In the south-central climate zone, this figure should be less than .3; in the southern zone, less than .27

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