Use this in mini greenhouse for "rotation planting transplants"? The thermal "battery" in a passive solar greenhouse - barrels of plain old water on the north wall of the structure. Warmed by day, they release their heat at night.
Love love love this idea! A Christmas Cabin. One that's decorated in Xmas decor all year with a beautiful artificial tree, with lots of bedrooms for family. And we go there every year a couple days before Christmas.