Right on. Greenhouse is on the list of things id like to get going here : )
How was dealing with the heat in it? You got an exhaust system or anything like that? Im not apposed to being the door opener but i would like some automation to the air flow, that seems like it would be nice!
You can buy an automatic window opener for greenhouses, just pops the window open at certain temperature. Pretty cheap but you can buy more costly systems if one wishes.
Supplemental lights and heat can see it run all winter but that's more for a sun room style attached to a house.