Yes, the Best Temperature Setting is 78°. Both winter and summer have ideal temperature settings for maximum comfort and efficiency. In winter, that temperature is 68°F. In summer, it's 78°F. This is enough to make a difference between the heat outside and the comfort inside, but not so high that your AC works overtime and you're paying. In the Summer, we recommend keeping A/C thermostats set at 78 degrees Fahrenheit or higher when home, health permitting. Every degree above 78 represents approximately 2% savings on cooling costs. In the Winter, we recommend you set your furnace thermostat to 68 degrees Fahrenheit or lower. Best Temperature to Set Your Thermostat in Winter The general consensus is that 68 degrees Fahrenheit is ideal. Spend a few dollars from that pile of money you’re going to save to get a warm hat and cozy fleet top to wear around the house.