Electricity usage - Refrig, Freezer, Coolers

Just starting out gathering equipment and wonder what kind of increase I should expect in my electric bill. I realize there are many factors that will affect cost, but I just want to know in general. I have an extra fridge made in 1990's and an old can coke machine that I gutted so it has no internal shelving. Does anyone have information regarding cost per month to run a fridge, two fridges, or chest freezers.

I would like to have a kegerator and also something to ferment in but I don't want to see my electric bill triple.

I guess the only other thing I can add is that this will be kept in a garage that has no heating or cooling....is it hard to maintain constant temps under these conditions?

Just the chest freezer kegerator and additional fridge/freezer combo (filled with soft drinks, beer bottles, hops and grain) newly added to my hot garage during the summer raised my electric bill about $30 a month.

my little chest freezer claimed something like $30 a year, but that's at some average $ per kilowatt hour. and it was brand new, so older appliances are cheaper, but less efficient...you pay one way or another

chest freezers have the benefit of not losing as much cold air when you open them. Now that I'm not running my a/c anymore, my electricity bill is $4 higher than last year, but I have no clue what the kilowatt/hour rates were then.