My home 1600 sq ft. single story- Built in 1980 faces south. Single pane. Two residents; Average $180 in summer. $75 in winter.
My 1890 sq. ft. two story faces east, with a big tree for shade. with 4 residents built in 1960 single pane average $280 in summer, $110 in winter
My 1400 sq ft built in 2006 two story faces south, one resident winter $120. Summer $80.
Lots of variables will affect your cost. How many people live there, what kind of appliances, tv, computers do you have, preference for temp, etc etc. Hope this helps.