I'm looking into using SPCs to insulate my greenhouse but am concerned about heat swings. In zone 9, cold fronts come for a few days, then leave, and the temperature goes back up to the mid-70s or upper-60s. If I were to cover a 32x12 greenhouse with a solar pool cover, would that cause problems when the outside temperature reaches 80 with 60% humidity?

Also, can someone provide the link for the Solar Pool Cover Makes a Great Sail thread, please?