Hi, i have 1 greenhouse and another is one the way, they are about 20 feet long 10 feet wide nothing to big, now that the weather is getting colder, i need to start thinking about keeping the greenhouse warm.
what is the best way to keep a greenhouse warm.
as it is only a backyard aquaponic system i dont need anything fancy, but open to all ideas.
so how do you keep your greenhouse warm?
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