Sealing and insulating the "envelope" or "shell" of your home — its outer walls, ceiling, windows, doors, and floors — is often the most cost effective way to improve energy efficiency and comfort. A high percentage (20-30%) of the the money you spend to heat your home in the winter and cool your home in the summer might be escaping. One of the best ways to find out if your home is too leaky, too tight, or just right is by doing an energy audit.
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