Heat

[Scythe13]

We're looking for a house and have found one we quite like.

The wife is allowing me to get a polytunnel for half the garden.

To keep it warm, I'm going to build a thermal mass rocket heater bench. But it might be a big job for a green house.

Best bet, insulate it to stop losing the heat generated, and the manure/compost idea (but beware of flies and other small pests that might arrive). Really like T-Odd's cheap heater. I think that came up in another thread. It's basically a load of layers of metal disk, and different sized clay plant pots. It works on the same principles that my rocket heater will be.

It all depends on the size of your greenhouse I guess.

Produce heat inside, stop it leaving, and stop the cold coming in. Insulate, and generate.