Jeannie Grassi wrote: > HI Ed, > I think these ideas apply to reflecting light, i.e. the sun. When light > "radiates" it can be reflected back for protection and thus the space > blanket is effective. With radiant floor heat there is no light > involved...only heat. Whatever it's called, the coils in the floor aren't radiant heat. It's convection, like the old also mis named radiators. Cold air sinks to the floor, is warmed by the floor, and little thermals break loose as the air warms, and rise up as more cold air pours in behind it from windows and walls. Radiant heat is just that. It's a heating element that isn't intended to heat the air directly, but warms everything in direct line of sight with it, which then warms the air secondarily. They are often used in large buildings, like hangars and auto shops, where there is a large air volume enclosed and big doors open periodically. You can stand 50 feet away from a radiant heater and feel it, even in below freezing air temperatures. For what it's worth, Ron N
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