Wait till she gets that June & July bill for cooling that upper level.
A lot of the larger 2 story houses out here have zoned systems. Basically you have 2 separate air conditioning systems running off of 2 thermostats. One for the upstairs and another for the lower level. While it is still far more expensive to run than a single story, one system unit, it really helps reduce electric bills in the Summer.
At night you can shut down the lower level, and cool the upstairs for sleeping. Then about an hour before you wake up you can program the downstairs unit to kick on and bring the temp down to a more comfortable level while raising the upstairs temp during the day.
Regardless a 4,000 foot house is going to run at least $400.00+ a month to keep cool in June and July. I doubt that will be a problem since Sarah Palin has earned an estimated $13 MILLION since she left the Alaska Governor's Office for greener pastures. Bill T.