Goyteamsix t1_iv7f13s wrote
Reply to comment by TheSiege82 in Researchers designed a transparent window coating that could lower the temperature inside buildings, without expending a single watt of energy. This cooler may lead to an annual energy saving of up to 86.3 MJ/m² or 24 kWh/m² in hot climates by mossadnik
I have reflective film on mine. It made a drastic difference. It works like a weak one way mirror.
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