Landscaping can do more than boost curb appeal. With thoughtfully chosen, strategically positioned trees and shrubs, you can actually keep your house cooler through the summer. After all, virtually all parts of the home exterior let in heat. To limit the effect, shade the roof with dense-canopied trees, ideally placed on the southern portion of the property. Also, deflect late afternoon sun with short trees, tall shrubs, or planted trelliswork situated along the western exposure.