Hi,
I have a Family of 5, the youngest child 16
I have a 3 bedroom flat, 4 bath rooms, Huge Living room
6 A/C's 4 Water Heaters and an electric Oven
( A/C's open 24/7 from Approx Mid April through to mid November and Heaters Open From September through to April-May)
In summer the bill would touch 1000-1100
In winter it might drop to 200.
Hope this would be of some use for you...