How to use Node-Red to turn on thermostat's fan?

I have a Radio thermostat wifi device that’s in Home Assistant. It has “attributes” that control things like temperature setpoint, cool/heat mode, and fan on/off. I’d like to control the fan on/off, but it’s not a simple entity, it’s a attribute of the thermostat entity.

Can anyone give me some guidance for using node-red to control the fan on/off attribute?

This topic should hopefully help. You basically need to call the service to change the fan mode.

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Thank you!