Just a tip from my friend who sells and repairs compressors. He told me I should always plug the compressor into an outlet and never use an extension cord. I suppose this wouldn’t be the case if you had a short 14 ga or longer 12 ga cord. He said the majority of repairs he does to smaller compressors are the result of people using an under rated extension cord, so to keep it simple he says to only plug into the receptacle.