My basement is at about 58 Degrees right now. I have my Carboy sitting next to our Furnace in the Basement, wrapped up in a Moving blanket. My Primary is sitting comfy at 68 Degrees, and happily bubbling away. I'm sure that the Carboy being close to the Furnace is gelping, but still, I am also sure that the Active Primary Fermentation has a lot to do with the Wort Temp. Cool stuff I tell ya.