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<blockquote data-quote="EdMuse" data-source="post: 1276249" data-attributes="member: 564149">Try this: put a piece of aluminum foil on a stove.&nbsp; Put your hand on the foil.&nbsp; See if the heat gets through.Now, try this: take a foot long piece of foil and twist it into a foot long &quot;stick.&quot;&nbsp; Put one end on a hot stove.&nbsp; Try to touch the other end and see of it is hot.Any material will absorb and transmit a certain manount of energy at a certain rate, and reflect a certain amount of energy.&nbsp; Metals absorb and transmit heat quite well.&nbsp; Aluminum foil is good for two reasons: it&#039;s reflective, so it does reflect more heat energy than it would if it weren&#039;t, and it absorbs heat quickly, so it releases that heat quickly as well, so if you heat it up, it cools quickly as well.&nbsp; But if it only reflected heat, people would be wrapping their houses just in foil, and not in foil-backed fiberglass.Since aluminum foil absorbs and releases heat so effectively, the foil wrapped around my ductwork would quickly rise to 150 degrees, then dump the heat into the dash.&nbsp; Whatever I decide to insulate with, I&#039;m sure it will involve a coiating of foil, but I don&#039;t think foil alone will do the trick.-EdM.</blockquote>

[QUOTE="EdMuse, post: 1276249, member: 564149"] Try this: put a piece of aluminum foil on a stove. Put your hand on the foil. See if the heat gets through. Now, try this: take a foot long piece of foil and twist it into a foot long "stick." Put one end on a hot stove. Try to touch the other end and see of it is hot. Any material will absorb and transmit a certain manount of energy at a certain rate, and reflect a certain amount of energy. Metals absorb and transmit heat quite well. Aluminum foil is good for two reasons: it's reflective, so it does reflect more heat energy than it would if it weren't, and it absorbs heat quickly, so it releases that heat quickly as well, so if you heat it up, it cools quickly as well. But if it only reflected heat, people would be wrapping their houses just in foil, and not in foil-backed fiberglass. Since aluminum foil absorbs and releases heat so effectively, the foil wrapped around my ductwork would quickly rise to 150 degrees, then dump the heat into the dash. Whatever I decide to insulate with, I'm sure it will involve a coiating of foil, but I don't think foil alone will do the trick. -EdM. [/QUOTE]

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