The key to your home's energy efficiency is, in part, tied to the temperature at which you set your thermostat. Variations in temperature do make a difference, and can affect your monthly bills.
In the summer, consider setting your thermostat between 78 and 80 degrees for optimal comfort and efficiency. In the winter, a thermostat setting of 68 to 70 degrees is ideal. The chart below demonstrates how thermostat settings can affect your utility bills.