Air conditioning efficiency is the result of carefully timed use and care for the unit itself. Air conditioners are designed for about a 20-degree change in temperature, which means that 100-degree air will be cooled to 80 degrees. With this in mind, don't allow the interior of your home to become dangerously hot since the air conditioner can't cool it down within a reasonable amount of time.
Air conditioning efficiency  can also be improved by shading the air conditioning compressor. Plant trees or shrubs to shade air conditioning units, but be careful not to block air flow. A unit operating in the shade uses as much as 10 percent less electricity than the same one operating in the sun.
Using Energy Star qualified ceiling fans can help cool your home without greatly increasing electricity use, as ceiling fans improve airflow and create pleasant breezes. But remember, a ceiling fan doesn't cool the room but instead cools you, so turn the fan off when you leave.
Finally, you've probably heard it said a million times: It's not the heat, it's the humidity! But did you know that there's something you can do about it?
Aprilaire makes a Whole-Home Dehumidifier that removes the proper amount of moisture from your home, and as a result keeps you comfortable while preserving your home. And unlike portable dehumidifiers that sit in the basement and constantly need to be emptied, the Aprilaire Whole-Home Dehumidifier is professionally installed into your heating and cooling system where it runs 24/7 to keep humidity down throughout your entire home. The unit can remove 90 pints of water a day from your home, leaving you cool and comfortable and contribute to air conditioning efficiency.