Automatic Temperature Controller with Thermistor (Incandescent BULB)
Here's an example citcuit for using a thermistor &amp; PWM controller (you could hack a dc/dc converter controller to do the job) as a thermostat to run your lights. The xfmr is to drop your AC mains voltage down to whatever supply voltage your MCU needs (a wall-wart would work, as long as your GND isn't isolated).