Too many KWh used in empty house
Hello. We have a brand new home which is Energy Star certified with all energy efficient hvac, windows, etc. We just received our first electric bill. It was for the time of March 31 - April 21 -- 21 days, and it said we used 1256 KWh. During that time, no one was living in the house. We visited a couple of times a week and moved some boxes in, but that was it. The only things plugged in were:
Gas furnace, set at 65 degrees (the weather was pretty mild during the time in question)
Sump pump
Dehumidifier
Microwave (never turned on)
Oven (never turned on)
Dishwashwer (never turned on)
Water heater
2-3 light bulbs
We had our refrigerator and washer & dryer delivered on 4/19, just two days before the end of the billing cycle.
Since we only used 990 KWh in the house we are living in for a 30-day period in April, we are wondering how it is possible that our empty house used so much electricity. We assume that something is not right, but the electric company is no help. Any idea what we should be checking and how we can determine what the problem is?
Thank you!