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For ventilation - could you maybe bury some drainage pipes to draw in fresh air for ventilation but let the air travel through the ground so its slightly warmer by the time it comes in?
Edit, like this but working in reverse in winter
Imagine you had a ventilation pipe spiralled through a hotbed before it entered the greenhouse, would that work/ do anything? 😆
apc
@edmundro
This is the potential space I’ve got for it, reckon it’s about 3.5x3m if I use the full length of the bed. Might got a little shorter and not incorporate that little tufty bed at the far end.
It’s a lot of digging to end up with a bed with a sunke walkway/cold sink. Not sure if I’ll get all the benefits of doing a full sized one but it looks fun.
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