The voltage to a residential thermostat?

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Multiple Choice

The voltage to a residential thermostat?

Explanation:
Residential thermostats run on a low-voltage control circuit, typically 24 volts alternating current supplied by a transformer in the furnace or air handler. That 24 VAC power lets the stat reliably energize and switch the control circuits to call for heat, cool, or fan without needing high line voltage in the wall. Using 24 VAC keeps wiring simple, safe, and compatible with most thermostat models and the equipment they control. Higher line voltages (120 or 240) would be dangerous for a wall thermostat and are used only for direct-line thermostats or other equipment, not the standard residential central HVAC. A voltage as low as 12 V generally doesn’t provide enough power for typical thermostat circuitry. So the residential thermostat voltage is 24 VAC.

Residential thermostats run on a low-voltage control circuit, typically 24 volts alternating current supplied by a transformer in the furnace or air handler. That 24 VAC power lets the stat reliably energize and switch the control circuits to call for heat, cool, or fan without needing high line voltage in the wall. Using 24 VAC keeps wiring simple, safe, and compatible with most thermostat models and the equipment they control. Higher line voltages (120 or 240) would be dangerous for a wall thermostat and are used only for direct-line thermostats or other equipment, not the standard residential central HVAC. A voltage as low as 12 V generally doesn’t provide enough power for typical thermostat circuitry. So the residential thermostat voltage is 24 VAC.

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