According to the United States Environmental Protection Agency's (EPA's) Energy Star Program, the attic is the easiest place to add insulation to improve your comfort and the energy efficiency of your home. No matter what kind of insulation you currently have in your attic, one quick way to determine if you need more is to look across the span of your attic. If your insulation is just level with or below your floor joists (i.e., you can easily see your joists), you should add more.

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In addition, in most homes the most significant air leaks are hidden in the attic and basement. These are the leaks that significantly raise your energy bill and make your house uncomfortable. Locating these leaks can be difficult because they are often hidden under your insulation. 

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