fml87

fml87 t1_ivak9lj wrote

In theory maybe but not in practice. The vast majority of the heat will be carried into the room via convective current. You’re also not going to get 50% heat transfer back out of an insulated window vs a sheet of fabric.

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fml87 t1_iv8udpl wrote

That doesn’t really make sense. Once the light has entered the space the energy is there. It doesn’t matter if that energy is spread over a large surface area or small, it’s the same total energy.

Curtains do make a difference because they do reflect light back out of the window even if they aren’t mirror-like.

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