The time on your clocks will be set back by one hour when daylight saving time ends this year. You should also mark that date on your calendar to make the following alterations to your thermostat settings, so your HVAC is primed for comfort and energy efficiency this winter. At the start and end of daylight saving time, most thermostats automatically adjust the clock twice a year. It’s a good idea to check that the time has fallen back, though, and if it hasn’t, change it manually so your thermostat settings remain the same. If your thermostat is still set for cooling, take this opportunity to switch it over to heating so your home stays comfortable in spite of the chilly weather. Make any necessary adjustments to your scheduled programming once you’ve switched to heating mode. By following these programming tips, you can set a schedule that matches your normal routine and provides optimal energy savings. Plan temperature setbacks at night. During the night when everyone is asleep, have the temperature drop by 10-15 degrees. During the week, set daytime adjustments. Set the thermostat 10 degrees lower if no one is home on weekdays. Setback periods that provide the greatest savings should be established. Setbacks of eight hours per day will save you the most money. Consider the time it takes for your HVAC to reach the target temperature when setting a schedule for temperature changes, so your home is comfortably warm when you arrive home each day.