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In respect to this, does foil reflect heat on Windows?

Tin foil works effectively to block radiant heat. Because of this, some people use it to block the heat of the sun by securing it over windows. Because tin foil is resistant to heat, it prevents much of the sun's heat from entering the house.

Similarly, does foil reflect cold? An aluminum foil keeps the food warm, but placing the foil directly on the object or food doesn't help much. It doesn't only keep the food warmer for long, but also keep things cold.It acts as barrier to the oxygen and air which can transfer heat to the cold or frozen food.

Similarly, you may ask, what side of aluminum foil reflects heat?

If you're baking or defrosting, the matte side will absorb more radiant heat and reflect less infrared heat while the shiny side will reflect more of both, so it makes more sense to bake and defrost with the matte side facing up.

Can you use aluminum foil as a heat shield?

No, it very well might melt and definatly won't stop heat. Aluminum melts at around 650 degrees celsius and any old tin foil you encounter is going to be 1000 grade aluminum, meaning pretty much nothing in it other than aluminum. You don't wanna use this stuff as a heat shield for your exhaust.