The Kill-A-Watt is an appliance energy monitor that can help you monitor your 120 V electricity users. You plug it into an outlet, and then plug an appliance into it to see how much energy it uses.  Like most appliance energy monitors, the Kill-A-Watt only measures 120 V loads. Bigger electricity consumers like your AC units or your electric dryer are probably on 240 V breakers, so to monitor these you will need a whole home or whole home circuit level energy monitor.

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