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Insulators wuch as wood, polystyrene and wool keep the heat in because the have trapped air inside them. I guess you would say that conductors (such as metal)keep the heat out because heat flows through them. Once they are warmed up and taken away from the heat, they start releasing the heat inside.
Wiki User
∙ 12y ago
Wiki User
∙ 15y agoThe walls, the roof, and insulation.
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How heat is useful?
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spell hear
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The skin keeps it in.
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a lot
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