We’ve been making some progress with the pallet shed. It has/will have an underfloor heating system using only the heat from our elusive sun. We have built a pit which we will line with clay and cover with glass. This will heat the air inside the pit which is connected to a trench which runs under the building. Today we finished lining the trench with polystyrene insulation. The idea is that the heated air will travel under the shed and warm it up. I’m not sure, but it is an ancient sort of technology and it’s just occurred to me that we could use the glass-covered pit and adapt the hotbed technique of fresh manure or compost which, as it breaks down, produces heat. Hmm. If anyone has any thoughts I’d be grateful to hear them. This is what it looks like so far.