Thanks for another really helpful response Jim. Really like the idea of reversible fans and I might try the Swedish Skirt method since the foundation's still exposed. Might be able to get a bunch of partial pieces of ICF, cut the middle plastic brackets off and use the foam for insulating the foundation and those wings that angle into the ground. It'll obviously be more labor intensive than buying full sheets of rigid foam but the price and the environmental impact will sure be less.
And yes, it's easy for me to get caught in the weeds of projects and forget to have fun with it. Need to keep appreciating that I'm damn fortunate to even be able to have a greenhouse in the first place.
Thanks again Jim!
