Filters have a efficiency rating called MERV, ( Minimum Efficiency Reporting Value). The higher the MERV rating , the cleaner the air and the better the equipment protection. Control dust, dirt, and pollen with high quality filters and/or air cleaners.
Raise the temperature settings. Each degree of temperature can represent up to 9 percent savings in cooling costs. Consider installing a programmable thermostat, which will make these changes automatically.