Originally Posted by El Pistolero
Stick your fermenter in a rubbermaid tub filled with water, then use ice blocks to cool the water...you can keep the temp down in the mid-60's this way pretty easily.
Or, have you ever tried the "T-shirt trick?" It will cool your fermenter without ice. Stick it in the tub of water, get an old T-shirt wet and put it over your carboy so that the bottom of the shirt is in the water. Let the neck of the carboy stick out of the neck hole on the shirt. It will wick water from the tub, the shirt will stay wet and the evaporation will cool your fermenter.