I agree with you coriasco, steady temperature is key to bulk aging, also keep the wine still and away from vibrations. I've seen folks with hardwood floor with fridges/dryers/washers on them andI could actually feel/see the transfer of vibrations fromt eh applicances tothe carboys. I use fleece carboy covers to keep my babies at a steady temperatures. Also, my wine room has an external wall that can get sunny, 2 pieces of 4x8 sheetsof plywood makes a 3 degree difference drop for me.