My "best" is around $17. Electricity is quite cheap here (I think a bit over 7 cents per kwh). So, I think around 225 or 250 per month for my 1000 square foot house. In the summer, with the thermostat set at 78F, my highest bill was about 65 bucks. The highest kwh per day during last summer was about 17 (on about a 95F, full sun, day).
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