Passive cooling

Cutting both heating and cooling costs with an innovative passive thermoregulating roof tile
Cellulose materials with different thicknesses of a coating that controls their ability to emit heat in the form of infrared light. Thor Balkhed
Passive radiative cooling gains electronic temperature control
Caption:Two samples of passive cooling devices were tested on the roof of MIT's Building 1: On the left, a sample of the new system, combining evaporative cooling, radiative cooling, and insulation. On the right, a device using just evaporative cooling, for comparison testing. Credits:Photo: Courtesy of Zhengmao Lu
New passive cooling system relys on evaporation and radiation not electricity
A passive cooling device powered by sunlight needs no electricity
New passive daytime radiative cooling textile makes a 4.8 degrees Celsius difference
Providing cooling without power
This Incredible Building Material Shoots Heat Into Space (So Buildings Need Less AC)
An unlikely competitor for diamond as the best thermal conductor