There's an inexpensive device called a "kill a watt". You can get these from Amazon or most hardware stores. You plug your appliance into it and then plug it into the wall. It measures how much energy you consume in real time or per 24 hours, etc. You can check the energy ratings on new fridges to compare how much savings you would get. For example, I recently replaced an over 15 year old bar fridge with one double the size and the energy consumption is roughly the same.
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