Good answer, banner!
I have taught my daughters to use less energy every chance they get. They love telling me how they sat near a window so they could read during the day without turning on a light, or how they put on a sweater when they're cold, rather than turn up the thermostat.
I open the windows as often as possible for ventilation. People lived like that since the dawn of time. How we've become addicted to A/C is beyond me. I didn't grow up with A/C. We used fans and open windows. Sure, we sweat some nights, but I lived to tell about it.
My utility bills are usually less than half my neighbors's bills. They all tell me how lucky I am, but none of them, not one, will try to live without A/C. Some of them never open their windows, year round. I can't stand how musty their homes smell when I visit, but to each his own, I guess.
You want to save? Look in the mirror, you'll see the person who has the greatest effect on your energy costs.