[hawk2100n]

I think a Raspberry Pi may be a little overkill. I have 2 myself however an arduino would be perfect. You could have the AC input signal on a digital input and read temperature via analog in and output a PWM signal to a motor controller which would simply be a high current transistor array that metered out the 12V with a 5V/3.3V low current signal. I'll take a look and see what I can find for pre-engineered transistor arrays. I'm sure there is something out there.