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Message: [QUOTE="KXaggerator, post: 221225, member: 21679"] I have an idea for controlling temperature during the fermenting. I am going to build an insulated plywood box with 6" of pulp insulation (around R17) and PVC rigid plastic sheeting on the interior for sanitation. I want to try using the heat/cool unit out of a 12 volt ice chest system. The heat and cool cycle are controlled by inverting the polarity. I plan to use a heat/cool thermostat with a hysteresis of one to two degrees. I also plan on installing a delay on relay to prevent constant on/off cycling. I plan to use a small fan to create a top to bottom current to stabilize the air temp. The mass of the wort should also help stabilize the temperature. I might also use a HEPA filter over the vent hole in the box. What do you think? Also Mr. Beer is DOA, he is going to be sent on to another home.:uh: [/QUOTE]