You can reduce the load on your central air-conditioning system with a few simple measures. First, be sure to clean or replace your furnace filters per the manufacturer’s recommendations.
To reduce heat gain, pull coverings over sun-facing windows. Stir up breezes using a whole-house fan or ceiling fans, or circulate air using the “Fan Only” setting on your heating system.
Also, when possible, minimize mid-day activities that add humidity to the air, such as washing and drying clothes, showering, and cooking. When engaging in these activities, use ventilating fans.