They bill in kilowatt-hours, which is a very different thing from straight watts.
Listen, if 220 is no more efficient than 110, then why do heating systems, dryers, ovens, etc. run on 220? Why do air compressors have the option to run 110 OR 220? 220 is more costly to install so it would seem there's absolutely no economic advantage to running it at all. The answer is that 220 is more efficient, gets more work done with less power, and therefore is cheaper in the long run.
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