How much heat from a lightbulb?

[FlyGuy]

Yes, you should be able to do what Orfy says with a thermostat -- just look household thermostats that are designed to run baseboard heaters. They are designed to switch a 110 v line, and should work wonderfully inside a fridge for heating purposes. They are also the least expensive type of household thermostat to purchase.

Note: stay away from most of the furnace thermostats because they are typically designed for 24v systems, not 110v.