Foil insulation is typically installed in home attics to help reduce utility bills. Radiant Barrier is preferred over other types of insulations because foil insulation reflects heat back to its source, while other types of insulation only slow down the transfer of heat. In a standard residential home, installing foil insulation in your attic can stop 95-97% of the radiant heat that strikes its surface. More than that, foil insulation resists heat gain in the summer months but it also reduces heat loss during winter months.