It couldn't get much hotter than the steel shed of a storage locker I have today (and for the past 10 years?)

I'm sure time is taking it's toll on these items, but at this point my storage bill is so high that I can air condition the attic. (just kidding)

What I can afford to do is put down a layer of insulation and then something like this, https://todayshomeowner.com/attic/vi...in-your-attic/

My storage unit is 10x30 (feet). My apartment is probably 20x50 feet. The attic access is very limited, and I can post those dimensions if it would be helpful.

Thanks for everyones help...

-John