I know it's 4 years later, but here's what i'm doing http://www.homebrewtalk.com/showthre...09#post7638609
and the kickstarter project is here https://www.kickstarter.com/projects...dge-controller
. This can be applied to the keezer configuration you are talking about, though i've not actually tested it in that configuration. The heat swap fans would be installed in the insulated wall that you would fabricate. If the project is funded, i might actually buy a chest freezer and try the system out on it.