1. Keep your blinds closed. As simple as it may seem, the Family Handyman notes that up to 30 percent of unwanted heat comes from your windows, and utilizing shades, curtains and the like can save you up to 7 percent on your bills and lower indoor temperatures by up to 20 degrees. In other words, it essentially prevents your home from becoming a miniature greenhouse, which is especially the case for south- and west-facing windows.
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