I have purchased a Fermwrap Heater to get my ale temps up a bit. I am curious how you all use this piece of equipment. I have a chest freezer and will be using a Ranco Two stage. I have been attaching the probe of a Johnson A419 to a glass carboy under a piece of foam. My question, are you wrapping the carboy or draping the heater on a wall and heating the chamber? If wrapping the carboy, are you wrapping directly over the foam?