Brent/Martin,
Thanks for the responses. I realize that these are very young plants and as such should be subjected to fewer fluctuations than older ones. My problem is I have had a lot more rooting success than I anticipated (thanks to those who provided cuttings/advice), it being my first try, and now I have nowhere to put them. Guess that's a good problem to have. So I will really baby the rare ones I have, but these extras have to go somewhere. I've given several away. For the rest it's either inside without being under a light or outside and somewhat exposed to the elements. This process should add to my understanding of what they can tolerate. If they all die, I won't be heartbroken. And if they live, then I know that they can take it.
I do have a thermometer inside the GH, and it looks like on a sunny day it heats up to 100 degrees very quickly. So if it's sunny, I really have to leave it totally open. And if it's below 45 degrees overnight, I'll wheel the whole thing into the garage. It really is no effort, so I don't see any advantage to leaving them outside if there's any risk of cold temps whatsoever.