Guys,
Some of us need to turn a heat source on. I have a little Jaycar thermostat in a non-working fridge. It is wired to some light-globes at the bottom of the fridge.
I set the temp guage, and during winter when it drops too low, on go the light globes to bring the temp back up. The fridge keeps it insulated so the globes are on for a short time each day which cuts the power costs (as opposed to a heat belt). Works great for me.
The thermostat works both ways, in that it can open a circuit if it gets too cold, or open another if it gets too warm. In theory you could mount it in a working fridge, with the same light globe set up in the bottom.
For $20, it was a worthwhile investment for me.