I have a temporary setup until I find a deal on a used chest freezer.
cooler, I have some sanitized water filled up about half way, then my carboy sits in the water bath. I put just a single frozen water bottle in before I go to work, and then one a bit after I get home, and it stays a constant 60-65. It honestly works TOO well. I made a faux lid out of a cardboard box I cut up.