Clever Glass

Vanadium dioxide coated glass can switch from transparent to reflective (of infra red) at a set outside temperature. Thus on a winter day it could allow all light through, for as much warming and SAD treatment as possible, whilst on a summer day it could reflect IR as soon as it reached 25C. This could lead to huge savings on air conditioning. Coupled with planned ventilation, it could do away with it all together.

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