I have the stick-on thermometers on my carboys. They sit in igloo icecube coolers . In the summer I use about a two gallon water bath and frozen water bottles to control temps. In the winter I can get by with just one or two frozen water bottles sitting in the bottom of the cooler.
As you discovered, even with ambients in the mid to low 60s, ale yeasties can rapidly heat things up.
EDIT - I fashioned covers for the coolers, and you would be surprised how steady you can keep fermentation temps with this low-tech method. Found the coolers a few years ago on sale at Target for about 20 bucks. If you are interested, make sure you get the kind without wheels, otherwise there is a large ridge inside the floor ofj the cooler.