Which thermostat terminal controls the indoor blower fan?

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Multiple Choice

Which thermostat terminal controls the indoor blower fan?

In a thermostat, each terminal controls a specific function by sending a 24-volt signal to the HVAC equipment. The one for the blower is the G terminal. When the thermostat wants the fan to run—whether during heating, cooling, or when you set the fan to ON—it energizes the G circuit, which powers the blower relay in the furnace or air handler and starts the indoor blower. The other terminals have different jobs: R provides the 24V power to the thermostat, W calls for heat, and Y calls for the air conditioner/compressor. So the terminal that directly controls the indoor blower fan is the G terminal.

In a thermostat, each terminal controls a specific function by sending a 24-volt signal to the HVAC equipment. The one for the blower is the G terminal. When the thermostat wants the fan to run—whether during heating, cooling, or when you set the fan to ON—it energizes the G circuit, which powers the blower relay in the furnace or air handler and starts the indoor blower.

The other terminals have different jobs: R provides the 24V power to the thermostat, W calls for heat, and Y calls for the air conditioner/compressor. So the terminal that directly controls the indoor blower fan is the G terminal.

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