Comment by boomskats

I once used a $25 off-the-shelf PID temp controller that came with a type K thermocouple and integrated 12v control line to build an air intake regulator for my meat smoker. I couldn't believe the outcome - 3 hours of fuel turned into 11 hours, and the (logged) temperature stayed between 118.4 and 122 degrees celsius for 10 hours of that. This was outdoors, with all the variance that comes with it, and all I did was attach an old 12v case fan and some aluminium ducting to one of the vents. Blows my mind to this day.