Some folks on the Yahoo list asked that I post some comments about my experience with creating a temperature controlled environment for fermenting a brew.
I have heard some great suggestions like put it in a closet and turn a little space heater up a little each day, and rotate a frozen milk bottle into the water bath each day for cooling, and these all sound good and not too time consuming, but I am more lazy than that.
I want to set a temperature profile, put my carboy in the tub, and come back in a week or two and keg it.