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In most cases, thermostat settings will save energy. However, there are a few situations where setbacks may not make sense, including heat pumps with electric resistance backup, radiant systems with long recovery times, and homes with very narrow building envelopes.
Steps to Save Money with Thermostat Adjustments:
1. Lowering the temperature involves adjusting the thermostat while you sleep or are away from home.
2. Lowering the thermostat in winter keeps the house colder, but the furnace doesn't start as often, so you use and pay for less energy.
3. In the summer, turning up the thermostat makes the house warmer but keeps the air conditioning system from running all day, reducing your electric bill.
4. There are several types of thermostats, including the simple manual thermostat, the programmable clock thermostat, and the smart thermostat with a motion sensor that you can access via a smartphone.
5. R-value is the amount of heat that is transferred from the inside of a house to the outside during the heating season, and from outside the house to the inside during the cooling season.
6. Delta T refers to the temperature difference reflected by heat transfer.
7. Imagine it's zero degrees outside and the thermostat is set to 70 degrees, which is called the target temperature.
8. If you lower the thermostat to 60 degrees, less heat will be transferred outside because there is less of a temperature difference between the indoor and outdoor temperatures.
9. According to the Department of Energy, for every degree you lower the target temperature, you will save 1% on fuel over an 8-hour period. In the example above, you would save 10% on your heating bill.
10. The amount of energy needed to heat a house will always be less than if you hadn't turned down the thermostat and had the furnace turning on and off all day. The same goes in summer with air conditioning costs.
11. Do not use a clock thermostat with an electric heat pump, super insulated home, or radiant heating system.
For more information, visit: Energy.gov [https://www.energy.gov/energysaver/thermostats]
Expert support for this project was provided by Nest Labs [https://bit.ly/36i4bPX].
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How Thermostat Rollbacks Save Money – Ask This Old House
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