As a general rule setting your thermostat at 78 for cooling in the summer and at 68 for heating in the winter will provide good energy savings. Depending on where you live and what the outside humidity is you may not be able to set your thermostat at these setting. In areas with high humidity setting your thermostat at 78 for cooling may not be within your comfort level. Your health may also prevent you from using these settings. The bottom line is the higher that you set your thermostat for cooling in the summer and the lower you set your thermostat for heating in the winter the more energy savings you will save. Update amazon now offers a free smart home consultation