If I add new siding to my house with a half-inch of insulation behind it, won’t it result in significant energy savings?
New siding has very little insulation value in itself. Its only energy saving benefit is some tightening up of the home. Adding a half-inch of white beadboard to an un-insulated wall will save approximately $10-$15 of natural gas per year per 1,000 square feet of wall surface in conductive losses. Adding it to an already insulated wall will result in even less savings.
