I know all about those temperature-spiking temps! I just moved from the central valley, where 110 wasn’t unheard of.
I pretty much moved here to Tenn so I could have a basement, LOL! Ok, a few other things like all the conservatives here and lower taxes. BUT I was so excited to have a COOL basement. But....if you ever get one, make sure it is unfinished. My basement has been a sore disappointment - instead of being 55 degrees, where I could store root veggies all winter long or ripen cheese - it is 65! I think because of the ducting and heat leaking out, although we have the vents closed. When hubby gets here, I’ll ask him to check it out. Otherwise, I may have to see if he’d consider digging me out a root cellar. What a waste though, because I have no other use for that huge basement!
You could put a big loom down there and take up weaving. That project is something I have always wanted to do. Now that I have the time, I don’t have the room. Ummmm move hubby out of his home office... :))