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Aluminium foil window treatments!
I just installed some. I used masking tape to affix Al-foil to the inside of my bedroom window, which was letting in a lot of unwanted light that was turning to heat inside my house. Metal foils have excellent optical properties: good reflectivity, nearly zero transmissivity (so it's almost black in my room with the window and door closed).
The objective was to reduce the temperature in my room, and it was definately successful. It reduced the temperature of my vinyl shade from 102°F to 82°F, and my desk thermometer hasn't exceeded 82°F while I've been home - A/C not yet required.
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