Hi Randy,
I grow/live in Arkansas so cool/cold growing orchids aren't something I know much about. My orchids have to be able to survive sweltering heat!
How cold is your lowest temperature in the GH? What do you heat with?
In winter, I line the inside of my gh with a heavy gauge opague plastic. It's attached to the framework creating about a 4 inch pocket between the outer shell and inside.
This helps tremendously with heating! I used to take it off in the summer but no longer remove it. I figure if it keeps out cold, it will also keep out heat!
So the plastic stays up on the walls and is removed from the ceiling or roof so the heat can escape. Shadecloth goes up in late spring.
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