Use radiant barrier for attic insulation in multiple climates. In warm weather, quite a bit of downward heat gain in a home is from radiant heat that penetrates your attic and seeps downward into your home, making your air conditioner run longer to keep your home cool. Likewise, in cold weather, 50-75% of your home or building's heat loss is due to radiant heat up the flow as the warmed air inside rushes out of your living space and into the cool air of the attic and outdoors. Fiberglass and cellulose insulation only slow down radiant heat gain or loss instead of stopping it. Only Super Shield reflective attic insulation blocks and redirects the heat. Radiant barrier attic insulation stops up to 96% of radiant heat transfer.