John-D-Clay t1_iv7f7mk wrote
Reply to comment by CSyoey 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
At most it would be equivalent to a mirror, doubling the sunlight. Assuming there aren't any stupid lensing shapes in the building like that one in London.
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