In the summer, your roofing really heats up! Sometimes up to 150 degrees. This heat radiates down from the underside of the roof and into the attic. The heat from your ceiling radiates down into the rooms, heating the air and all the objects in the room. This makes your air conditioner work harder and for longer and makes your upstairs level uncomfortably hot. Stefan's Radiant Barrier can help. It is installed across the bottom of the rafters. Resembling foil, the barrier reflects much of the heat and keeps the attic much cooler.