If your rent includes electricity or you're willing to pay for another appliance just get a mini fridge for your carboy or ale pail. This time of year is the perfect time to start looking as college/university kids are writing their final exams and many of them have mini fridge for their rooms. Some students will keep them but a lot would sooner get rid of them and just buy a new one next year.
Last year I didn't brew, so when I walked by a STACK of them outside a residence building on campus I didn't bother taking one. I'll be taking a measuring tape with me to campus over the next couple of weeks for sure!
Finding a cooler spot to brew will reduce the amount of energy the mini fridge has to draw in order to maintain the right temperature so I'd suggest asking friends and family who have basements if you could shack your brews up there all summer. I'll be brewing at my girlfriends basement apartment and although she hasn't asked for anything in return, it gives me an excuse to brew here a batch of Apfelwein that we can share!
Primary: Edwort's Apfelwein
Primary: Brewingcentres Pale Ale
Primary: Brewcraft - Cheap 'n' Shiddy Bavarian Wheat
Kegged: Brewcraft - Cheap 'n' Shiddy Bavarian Wheat
Kegged: Brewcraft - Enhanced Dutch Lager
On Tap: Brewcraft - Irish Stout