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A fridge that won't stay cold is usually suffering from a bad thermostat or a dirty coil. Both of these problems can be fixed in about an hour, and will cost about $50 to $250.
A typical refrigerator has a 10- to 20-year lifespan. The longer you have had your refrigerator, the greater the potential repair cost. If the refrigerator is less than eight years old, consider repair. If the refrigerator is more than 15 years old, consider replacement.