First off- I am an almost constant AHA and HBT forum consumer, but have never posted before. I wanted to share the build I just did for what is now a fermentation chamber with controlled heat, but will eventually be upgraded to cool as well for lagering and summer fermentation. Built for around $61, with only a razor, scissors, a screwdriver, and some wire strippers (and of course, duct tape). I have a couple before/afters, and maybe enough throughout the process to build a walkthrough if folks are interested.
Apologies for the fuzzy pictures- it was dark and the reflective insulation was shooting back the flash.
The heat is controlled by a standard light dimmer, and the heating element is a mat for sprouting seedlings that I picked up at my LHBS that also happens to be an organic/hydroponic gardening center.
There is still some insulation that needs to be attached on the lower sides and lid, but it is mostly there.