To regulate the temperature in our GeoDome greenhouse, we used a Water Tank for passive temperature regulation and also an old car radiator for active heat exchange. To use a gas or electric heater can be costly. This used car radiator did the trick for u
Shed Plans - DIY rustic window greenhouse - Take the full tour of this hand built greenhouse made out of antique windows inside out! Now You Can Build ANY Shed In A Weekend Even If You've Zero Woodworking Experience!