sumatra01

Fascinating concept. I've heard that normal pit greenhouses which stay at 50-55F, requires around 4 feet of digging. But to make this shallower, then balance it off with heat sinks makes things far more interesting. That also allows light to reach the entirety of the plant which most ignore, and keeps the top of the structure close to the ground, reducing heat loss through wind chill. Definitely looking forward to seeing how it works for you through the winter.