There's no such thing as a free lunch.
One of the reasons I did not go with an old freebie fridge is that they eat electricity like candy. If you have one of these old freebies, I wanted to share this site with you:
http://www.energystar.gov/index.cfm?fus ... calculator
You can go here and enter the model number and the $/kwH and it tells you the annual cost to run the fridge. A free fridge isn't that helpful if it's burning through $250 in electricity every year. If you see the cost is pretty high, you might save money after a couple years to buy a new one, or more your kitchen fridge to the garage and buy a new one for the house. My local power company will actually give you $35 for the old fridge!
(Caveat: I know these numbers are significantly different for a garage fridge, especially in where I live in Colorado, but it's a starting point).
Just a thought from someone who hates paying the power and gas bills!