Cellar in Garage in Michigan

I've used a fridge in a non-insulated garage in Illinois. The only issue we had was that once it gets below freezing, the coils don't work effectively. I can't say if that was due to the design/age of the fridge, though. I'd recommend looking up the specs on your model. I'm sure it has a recommendation on exterior temperature.

 

the only issues ive ever had with this is fridges can have mechanical/electrical problems when kept on a concrete floor in a garage. as long as your fridge keeps running and doesnt trip any breakers/gfci's then your beer will be happy.

 

Your fridge/freezer's insulation should provide some buffer of protection from the freezing temperatures. You could always toss insulation around it if you think it is going to be a problem. What do I know, I think freezing temperatures is 32-deg for a few hours at night a few days a year.

 

Just unplug the fridge once temps are freezing. It's not like the compressor puts out heat, so I'd just throw some big blankets or something over the fridge and unplug during the freezing months. Or just leave everything in boxes so you can just transport it easily to your basement during the freezing winter months. The second option would probably keep your beer in the "sweet spot" temp for aging. GL!