The problem: All greenhouses in a cold climate need heat. So they consume energy and require human discipline. At the same time, it is possible that on a sunny day, a greenhouse can get hot enough to kill everything inside.
The solution: We have a plan to create a greenhouse that requires no heat, and will never overheat. Mostly, we will use the heat from the summer to heat the structure through the winter. And if we have a moment of excess heat we will passively store it and save it for later - with no harm to the plants, all with no need for human discipline.
The Greenhouse is Built, and the Movie is in Production!
This came at the perfect time, getting ready to design a greenhouse for my market garden next year - can't STAND the polytunnel plastic structures. Was already thinking a sink it ~3 feet into the ground but those little ideas in the vid got my brain working.