Air-conditioning is the peak driver of energy use in California. This means that it ultimately determines how many power plants and transmission lines that are needed.  The electricity costs for air-conditioning can be a few hundred dollars per year, or well over one thousand dollars, depending on where you live, how much you use it, and how efficient your air-conditioning system is.

Take advantage of passive solar cooling to the greatest extent possible.

During the summer months: 

• Set your thermostat for 78 degrees Fahrenheit, and higher (85 degrees Fahrenheit) when away form home for more than 4 hours.  Each degree that you raise the temperature saves about 2% of your cooling costs!
• Close your shades to limit the sun's hot rays.
• Use room and ceiling fans to reduce the need for air-conditioning.  Also consider installing a whole-house cooling fan.
• Clean your forced air system filter at least once per year.

Make sure your air-distribution ducts do not leak and are free of obstructions.  A professional Heating, Ventilation and Air-Conditioning (HVAC) specialist can evaluate this for you.  Leaky ducts can reduce the efficiency of your heating and cooling system by 25-35%.

If your air-conditioner is older than 10 years, consider buying a new Energy Star unit with a Seasonal Energy Efficiency Ratio (SEER) of at least 12.0 (the higher the SEER, the more energy efficient the unit).  Ensure the unit has a TXV (Thermostatic Expansion Valve).  Check for utility rebates, they can be significant.

Consider buying an evaporative cooler.  They cost less than traditional air-conditioners and can cut cooling costs significantly.

For more air conditioning tips, see the SCE web site.