I made this solar powered climate controlled house for an engineering class back in college. The walls are made of blue insulation foam. The window is a double layer of acetate. The rectangular bottom contains a large concrete tub full of water for retaining heat come nightfall. The water is covered by a glass floor making the final building more of a crazy discotheque than a house! Electronics include a servo, fan, LEDs, rechargeable 9 volt battery, solar panels, temperature sensors, propeller microcontroller, and a switch.