heating with compost?
My first post to this forum. I'm just about to complete my first greenhouse, built on the cheap with recycled cedar and spruce lumber, a set of "easy up" connectors, and some 6 mil greenhouse plastic. The dimensions are 10x12, and the height is about 8'. I have two upper window vents, one operating with an automatic opener. I have an air intake vent that will be manually operated. The north wall is plywood, painted white.
I plan to heat the structure with water barrels, a small electric heater (if necessary) and a trench full of nice hot compost.
I have access to as much horse manure as I can use, as well as some sunflower seed "tailings" from a small biodiesel operation. The manure and the meal make a powerful and consistently hot compost.
I plan to dig a 2-foot deep trench along the sunward wall of the GH, under the benches. I also read about putting a pipe through the center of the compost and creating a hot air "duct" of sorts.
Does anyone have experience heating a GH with compost? Any advice?
I'm in USDA zone 5 / Canadian zone 6b.
Thanks in advance,