Solar window heater update


I’ve been fixing the window box heater. It’s been working OK over winter but not to its maximum. I’ll rebuild it over Summer and add a temperature control so that it only comes on when the air temperature in the box is over 20°C. I’ll use thick glass as the cover instead of thin perspex…

Window box heater


Last year I started fiddling with passive heating and whipped up one of these window box heaters. I found several flaws with my design and have since learned how to improve the efficiency greatly. For this test, I just leaned it on the sill of the kitchen window (the most northerly facing window) in the…