Mini refrigerators, also known as compact refrigerators, vary in size from 1.7 cubic feet up to 4.5 cubic feet. The smallest cube-shaped mini fridge measures 17 inches wide, 18 7/8 inches deep and 20 1/2 inches tall. A larger 4.5 cubic foot model with a separate freezer measures around 19 inches wide, 20 inches deep and 43 inches tall.
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While the smallest mini fridge keeps your sodas and snacks cold, the cost of running it may be nearly as much as a full-size refrigerator. A 1.7 cubic foot refrigerator uses 30 kWh per month, according to Silicon Valley Power. Meanwhile, the Energy Star rating on a 4.5 cubic foot refrigerator is 235 kWh per year, or nearly 20 kWh per month. When searching for a new mini refrigerator, look for the Energy Star rating to ensure that you're saving energy and money while keeping your food cold.