Many people don't realize that their cooling system is one of the biggest energy guzzlers in their home (second only to their heating system, depending on where their live). If you have an old air conditioning system with a SEER rating of less than 8, it may be worthwhile to consider replacing it with a more energy efficient system. Generally speaking you should be able to recoup the cost in just a few years.

So what exactly is SEER? SEER stands for Seasonal Energy Efficiency Ratio and is a measure of the cooling efficiency of your air conditioner or heat pump. The higher the SEER number, the more efficient the system is at converting electricity into cooling power.

Matching your AC unit size to your needs is important, too. An air conditioning unit that is too big for the room will work harder and cost you more.

It's also important to remember that because your AC unit can be such an energy guzzler reducing your AC bill helps more then just you and your checking account - it also helps the environment. When the average US household uses 9,000 killowatt hours a year any reduction in power usage helps the environment. Consider this - generating 9,000 killowatt hours of electricity generates as much pollution as driving 13,392 miles in a car.

Here are some more fast, free and easy ways to lower your air conditioning bill.

• Close drapes on the sunny side of your house.
• Close off rooms that you aren't using and the cooling ducts to those rooms.
• Turn off lights when not in use - because lights produce heat they make your air conditioning system work harder (and cost more).
• Turn off your computer and other home office equipment - because they generate heat as well.

If you can afford to invest a little money into your AC existing system you have a few more options. You can:

• Install a programmable thermostat (preferably one that offers zone control)
• Check and replace your filters regularly, a dirty filter can actually cost be costing you money each month.
• Install aftermarket energy saving devices such as a Cool-N-Save(tm)

Remember because your AC unit has the potential to draw so much electricity by maintaining and optimizing your current system you can reap substantial financial benefits.