Most of the heat entering a home comes through the roof.  Radiant barrier foil insulation installed in an attics can reduce attic temperatures by up to 30 degrees when stapled with a staple gun to the underside of roof rafters by REFLECTING up to 97% of the radiant heat that strikes its surface thereby reducing heat transfer from the attic to living spaces resulting in lower utility bills.  This method also reduces the heat subject to attic mounted AC duct work thereby allowing them to work more efficiently.