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JLC · AUGUST 1989 Radiant Barriers– High Performance or Hype "Just the facts, m'am," was a line immortalized by the TV series Dragnet. Trying to get just the facts about radiant barriers is like trying to solve a bunch of who-done-its. Even after a lot of digging, you still don't have all the answers. Where is Sgt. Joe Friday when we need him? Researchers have long confirmed that radiant barriers can cut cooling bills in warm climates. But since the upsurge of interest in the 1980s, questions have arisen faster than scientists could provide answers. Here's an overview of what we know about radiant barriers today, and what remains murky. It's a System How radiant barriers work seems pretty simple in