Retrofit Insulation

It's possible to retrofit insulation into an existing home, even without the access provided by remodeling. The choices, however, are much more limited. There are some retrofit insulation products that are designed for minimal disruption to finished wall or ceiling surfaces. Significant gains in R-value, however, may mean hiring a professional to assess your needs and devise an energy savings plan. Small or large, insulation projects can yield substantial gains in R-value and in comfort.
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Adding Insulation

Install additional attic insulation at right angles to the previous layer. You don't have to use the same type of insulation - it's fine to use batts or blankets over loose-fill, or vice versa. Upgrading from three inches to 12 inches can cut heating costs by 20 percent, and cooling costs by 10 percent.
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U-Value Windows

The lower the U-value, the better the insulation. In colder climates, a U-value of 0.35 or below is recommended. These windows have at least double glazing and low-e coating.
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Hot Water Savings

Water heating typically accounts for 14 percent of your utility bill. Repairing leaky faucets, insulating the water heater tank and hot water pipes, and installing low-flow faucets and shower heads can result in significant additional savings.
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Weatherize Your Home

By simply caulking, sealing, and weatherstripping around all your windows, outside doors, or where plumbing, ducting, and electrical wiring penetrate exterior walls, floors or ceilings, you can save 10 to 25 percent of your heating bill.
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Dirty Insulation

Look for dirty spots in your insulation, which often indicate holes where air leaks into and out of your house. You can seal the holes by stapling sheets of plastic over the holes and caulking the edges of the plastic.
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