You may just need to re-think your setup. I used to grow with 1000w in a closet (not an apartment tho) and with the door open it was ok, but it needs to stay shut these days and like you, I cant really come up with a good or cheap solution (portable air conditioners are expensive and still need ventilation)

I suggest doing a search on google or something for DrBudGreengenes method of micro CFL SoG growing, with his small setup he gets at least a 1/4 a week to smoke.

Im thinking of switching to this style myself if I cant cool this closet, either with CFL like he does (its cheap and can get it all at lowes), or maybe step it up a bit and get a bigger flowering box and sell my 1000w and toss a 400-600w in there instead, and have it be stealthier and have an easier environment to maintain. that way instead of it being a grow closet, its just a closet with a locked up cabinet inside. they key is just making it perpetual so you get a lot of smoke for a little space :rasta: