| http://www.w3.org/ns/prov#value | - According to the National Association of Home Builders (NAHB), The tax credit for efficiency upgrades in existing homes (Internal Revenue Code Section 25C) is available for 30 percent of the cost, up to a $1,500 limit for 2009 and 2010, for the installation of certain types of insulation, windows, roofs, water heaters, heat pumps, air conditioners and furnaces.
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