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If you have a house which heat doesn't penetrate easily, your unit will have less heat to remove.

Keep the direct sun from reaching the house and you've won the first battle.

In a new house, generous roof overhangs are a logical and effective solution.

If the house you plan to buy or build won't have big overhangs, you can still do a fair job of keeping the sun off walls and windows with properly designed trellises, fences and awnings.