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🌡️ How Thermostats Decide When to Heat or Cool

See how thermostats sense temperature, switch equipment, use feedback and deadbands, and add smart scheduling without losing the basic control loop.

lessons

~10 min

to learn

🤖 Technology

subject

Adults

level

Start the course →

What you’ll learn

A thermostat makes a control decisionExplain how a thermostat turns a temperature choice into a call for heating or cooling.Bimetal and mercury mechanisms show the old pattern: sense temperature, switch a circuit, and use a differential to avoid constant toggling.
Electronic sensing closes the loopTrace how an electronic sensor and feedback controller turn temperature into repeated equipment decisions.Thermistors provide a measurable signal; the controller compares it with a setpoint, allows for delay, and uses hysteresis to keep operation stable.
Smart thermostats add timing and contextDistinguish a thermostat’s basic control loop from smart scheduling, connectivity, and whole-system constraints.Learning, occupancy, remote control, and demand response add inputs and timing choices, but sensor placement and the building still determine the result.

Questions this course answers

What does a thermostat's setpoint represent?

The setpoint is the target used by the controller when deciding whether to call for heating or cooling.

How did a classic mercury thermostat switch a circuit?

Temperature bent the bimetal, tilting the sealed vial and moving mercury onto or away from electrical contacts.

What does a thermistor provide to an electronic thermostat?

The controller measures the thermistor's resistance or the voltage it creates in a divider circuit.

Why does a thermostat use hysteresis or a deadband?

A differential between turn-on and turn-off reduces chattering and short cycling caused by noise and delay.

What makes a thermostat a feedback controller?

The controller measures how the room responds, then uses that information to decide the next command.

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