The point is this: the freezer is a large current draw when the compressor starts and runs. The typical cord you might use is too small gauge. It would cause voltage drop....bad for the motor; and might get hot....bad for your insurance policy. If you must use an extension cord, get the shortest one you can find, and I would get perferably a 12 guage cord. Absolute minimum acceptable would be 14 guage. DO NOT use a 16 or 18 guage cord.