I know you're asking about how to keep it warm, but don't forget that it might get too warm in there on a sunny day even when it's pretty chilly outside. If I had anything in my greenhouse right now, I'd want to either be here to monitor temp and open vents if necessary, or turn on the automatic vents.
Your greenhouse looks very nice and I'm sure you'll enjoy it. I think you should tear down the pool house!!!
Sherry
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