Having the correct fermentation temperature is crucial for high quality beer. I made this temperature controller in order to exactly set the temperature of a discarded refridgerator.
Starting with a project box.
Drilling some holes.
Separating the left and right side of a power outlet, by cutting away the bridge and adding insulation material.
Assembly. There is one extra outlet controlled via a switch. Can be sued for pumps or other equipment you want to control.
The left outlet in the double outlet controls the heating and the right controls the cooling. I connect the fridge power cord to the cooling outlet and a heater that i put inside the fridge to the heating outlet. This way you can set an exact temperature on the