Originally posted by Snadger
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If you want to try this as Snadger said earlier on they uses brick based cold frames and greenhouse and you needed a layer of at least a foot across the frame and it has to be fresh then cap it off with soil ( about 6" worth) Failing that my dad used to have a big compost bin about 6ftx3ftx3ft and he would fill this then put coldframes on the top but it really only keeps them a couple of degrees higher.
I have thought about making a bin using old radiators and then running a pipe into the greenhouse to see if that would work.
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