That seems high. Since you have already double checked usage, that's a place to start. If the same stuff in VA pulled half the kwH, something is pulling current off your meter.

I'd look at the age of your systems to see if that's a contributing factor, but the other thing would be to invest in a home energy monitor that can tell you a bunch of information like which circuits are pulling what amounts and exactly when it's happening - however, if you arent comfortable around electric you might need to pay an electrician to set it up.

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After that you can look at things like insulation, and leaks.