New answers tagged energy-efficiency
You could make an insulated panel that is spring-loaded to the open position. Keep it closed with door holder magnets like this .You could wire the fan and magnets to a double pole switch that cuts magnet power at the same time it turns on power to the fan. Might cost a bit and take some research... but it would be cool (pun intended)!
I used to store 6 months energy for heating my home. The technology I used was cheap and compact and was in the form of a 300 gallon steel tank that holds kerosene. I doubt you can get any cheaper or compact than that. It's pretty safe so long as you regularly monitor the condition of the tank. Building is simple, you need to construct a base which is ...
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