Thanks for the replies everyone. I wish I could have mh lighting in there. Unfortunately, there is only an extension cord out there, so supplemental lighting isn't possible. It is actually pretty bright here, just not sunny. I wrapped the whole gh in plastic like a present today and removed the shade cloth. When the sun came out, I was able to get it up to 79.
I have a fan on in there now, it does a good job of stirring the air up. I think I will try adding another fan if I notice any problems starting.
One piece of advice I would give to anyone thinking about growing in a gh would be to have it up and running for awhile, then decide what plants to put in it. I did it the opposite way and built a gh to house the plants I already had. This results in me trying to meet their needs instead of going the easy route you described and picking plants that suit the gh. I guess I don't want things to ever be easy.
