Two days ago, my Hi/Lo Temp was 113.4/25.9. In positive news, last night I left a 1500 Watt heater running and kept the temp about 9 degrees over the outdoor temp and I got to leave all my plants in there. It was getting to be quite a chore to put all the plants in the garage with a sprained ankle.
I kind of assumed shade cloth was for people in CO, CA or Arizona. It gets hot here, but the amount of time it's oppressively hot isn't very long. A couple years ago, I didn't even put my window air conditioner in the house. I couldn't have been more mistaken that the high desert States are the only place needing cooling. The other day when it was 113F inside, it was 41F outside. I had no idea the differentiation would be so great with the roof open.
I don't think I'm going to keep anything in it once I've got my seedlings in the garden. I might do shade cloth next year, but I'll have too much going on to install it this year. In the winter, I hope to try to keep some zone 5 perennials covered up in there, and on sunny days, be able to sit in my lawnchair without a snowmobile suit on.