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Closed loop:

1. Thermostat --> furnace (constant temperature)

2. Toaster setting (light/dark) --> toast (IF the toaster has heat sensors)

3. Refrigerator cold/hot setting --> refrigerator inside temperature (constant)

4. Temperature setting for oven (not stovetop) --> oven temperature constant

5. Clothes dryer with moisture sensor

6. Washing machine water level

Furnace.

Temperature sensors control when furnace is turned on. Heating sensors in furnace control when air blower is turned on, and when flames must be turned off.

Refrigerator.

Temperature sensors control when refrigerant cycle turns on and off.

Many TV functions, internal operation of disc playback and record, really ad infinitum.

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