Bill, nice greehouse you've got. I wish I could have the space for one too.
Can you take a picture of the outside? It's facing on which direction? I'm asking this because, even with roof shades and windows opened, it can be really hot in summer (I'm sure you've tought about that).
At least here, in summer, we have 38ºC or 40ºC with 15% humidity. Without some "countermeasures",it will be very difficult.