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2. Fact check: Does setting my thermostat at 68 degrees ... - AOL

   www.aol.com/fact-check-does-setting-thermostat...

   According to the U.S. Department of Energy, people can save up to 10% per year on heating and cooling expenses by dialing their thermostat back eight hours a day from its normal setting, between 7 ...

3. Thermostat - Wikipedia

   en.wikipedia.org/wiki/Thermostat

   A thermostat exerts control by switching heating or cooling devices on or off, or by regulating the flow of a heat transfer fluid as needed, to maintain the correct temperature. A thermostat can often be the main control unit for a heating or cooling system, in applications ranging from ambient air control to automotive coolant control.

4. What should you set your heat to in the winter? Avoid ... - AOL

   www.aol.com/set-heat-winter-avoid-thermostat...

   For that reason, the average Energy Star-certified smart thermostat can save about 8% of a homeowner's annual heating and cooling bills, according to Consumer Reports. Check for tax incentives and ...

5. What Temperature Should You Set Your Thermostat When ... - AOL

   www.aol.com/temperature-set-thermostat-youre...

   According to the U.S. Department of Energy, you can save 10 percent on your heating bill when you change your thermostat by 7-10 degrees for just eight hours a day.

6. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   The control system can compare the temperature of the outside air vs. return air, or it can compare the enthalpy of the air, as is frequently done in climates where humidity is more of an issue. In both cases, the outside air must be less energetic than the return air for the system to enter the economizer mode.

7. Heater core - Wikipedia

   en.wikipedia.org/wiki/Heater_core

   In a car equipped with air conditioning, outside air, or cabin air if the recirculation flap has been set to close the external air passages, is first forced, often after being filtered by a cabin air filter, through the air conditioner's evaporator coil. This can be thought of as a heater core filled with very cold liquid that is undergoing a ...