HKei t1_iv9c0dh wrote
Reply to comment by fml87 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
They also absorb and re-emit heat, some of which will go into the room, though some will go right back outside too.
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