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Your electric bill is computed in kilowatt-hours. This is a measure of power over a period of time, which is a combination of volts and amps. Amperage at 240v would be half that of 120v, but obviously the voltage is double. So the net watts are the same. As a result, your net kilowatt-hours will be the same whether you use 120v or 240v.

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15y ago
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15y ago

No, if you check the amperage of the 120 volt unit it will draw twice as much as the 240 volt one. Your power bill is based on watts. W = Amps x volts. Say the 240 volt A/C draws 6 amps, 6 x 240 = 1440 watts. Now the 120 volt A/C draws 12 amps, 12 x 120 = 1440 watts.

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Q: Is it cheaper to run a 240 volt window air conditioner than a 120 volt widow air conditioner with same BTU?
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