Environmentally Friendly Solutions

Turn off furnace pilot lights during the summer, but check with the gas company first.
Use fluorescent lights where possible. A 25-watt fluorescent will provide light equal to a 100-watt incandescent.
Replace leaky faucets; repair all water-wasting fixtures. A dripping hot water faucet makes a hot water heater keep working.
Utilize working shutters, interior or exterior, to control heat gain or loss.
Close off unused rooms.

Clean air conditioning filters regularly. Replace immediately when worn out. Keep coils or fins of air-conditioning units free of dust, lint, etc.
Deflect daytime sun with awnings on windows or draw draperies and pull shades on sunny windows.
Use an attic ventilating fan instead of air conditioning. They do a remarkably good job of keeping air circulating. A 1,400-square-foot attic should have at least 5 square feet of ventilation.
Install a turbine ventilator on the roof to pull hot air out of the attic.
Run air conditioners only on really hot days.
Are you using more light in certain situations than is needed? Each watt of lighting requires the expenditure of 1/2 watt of air-conditioning power.
Combine circulating fans with room air conditioners for best air distribution throughout the house.