We're mid to high 90s here in the Midwest, but the humidity is what drains me the most.
My upper mancave is well insulated but without AC it gets to the high 80s later in the afternoon when the Sun hits the side of the building. Down below I have no AC (well, there is a small 5000 BTU window unit) but it generally stays 10-15 degrees less than the outside temps. And it cools down over night. Fans help move the air and make it bearable.
Today I did some moving of parts to free up some space for future projects. Put up some additional shelving in the upper area:
Unfortunately most mornings I'm outside a lot and it's getting more and more unbearable the older I get
.
Stay cool!
TomK