light bulb to keep fridge warm?

I went to the hardware store and bought a single light fixture with a pull chain for on and off. I pulled the bottom excess door to the frig. and mounted it on the wood in front of the frig just inside the access door. Which is about all the space you have to mount this. I put a 60watt light bulb in it. And like said above I put a dual plug outlet and plugged it into the outlet the frig was plugged in. When I am in real cold weather where I know the temperature will effect the cooling of the frig on electrical mode. I open the bottom access door and pull the chain to turn the light on. Then I put the door back on. It has worked fine for the last 6 years. From what you have said you will have to get 110V to the back of your frig.You will need the old time light bulb. The new type light bulbs don't put out the heat. I stocked up on the 60 watt old style light bulbs so I would not have that problem for a very long time.