Yeah, that's a PITA. Really a simple box, lined with some reflective insulation and plopped onto the floor will be just perfect. I even know where it will fit - back by the oil tank in this kind of almost-dead corner and furthest from the wood stove. I even have a way to vent in some cool air in winter when the stove is blasting (sounds odd, I know) and in summer, it's always cool in the basement anyway. Definitely can get a steady 60 degrees in there, maybe a little less.