I almost bought a window AC box last year, before the big artery blowout. Can't remember why I decided not to, but I regretted it soon enough.
I'm living in the same house as my mother and my sister (I'm supposedly the 'caretaker'...hah!). Both of them smoke and neither of them can leave the thermostat alone, so the place smells like an ashtray and it's always too warm (80?! Seriously?!) or too cold (65?!) because Mom can't make sense of the thermostat settings.
On top of that, my room stays hot year round because of my computer and a mini-fridge (no thanks to Hank--I got the fridge to keep him out of my food & drink stash). It's early spring and already close to 90 in here. Last summer was hell once all the health troubles kicked in. The AC box is my one splurge for the next few months, one thing I can do for myself right now.