Underneath it All

Traditional greenhouses can overheat when the sun is out and freeze in it's absence. Typically, electrical or gas heating and cooling systems are installed to counteract adverse conditions. Our goal is a passive solar greenhouse, meaning it is "off the grid".
Our subterranean heating and cooling system uses the ground of the greenhouse as mass and a solar operated fan to help moderate the temperatures by pushing air slowly through the 4" perforated pipes. This system has the added benefit of keeping the roots of the plants warm and moist because it runs under the planting beds.


This is the Plenum, home-made made from a used hard plastic drum. It is a separate space compartment for air circulation. (heating, ventilation, cooling). The fan goes inside here.