The average air conditioner uses about 3,500 watts of power to run and nationally, the average price per kwH is 13.19 cents. In California, it is 18.34 cents.

This means every hour you run the AC, costs roughly about .64 cents in California.
If you run it for 8 hours, that is about $5.15. Do that for a month and you are already over $150, just for the Air Conditioning.

Unfortunately, most Central Air Systems don't allow you select which room to cool, which means if you need to just cool 1 room, you have to run the system for the entire house. 

Having a portable cooling system like the Pure Air Today, will allow you to cool the room you are in, so you don't have to waste electricity on rooms that don't need to be cooled.

The Pure Air Today runs at 110 watts, which means is costs less than 2 cents to run per hour. That is a big savings!