1.Use your blinds, open them in Winter on the sunny side to let heat in... close them on the non sunny side then do vice versa for summer.
2.Replace filters regularly
3.Find a system with a high SEER the higher the better.
4.Make sure vents have nothing over them or anything reducing air flow.
5. Make sure all doors are closed to prevent heat from escaping.
http://www.energyright.com/
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