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I have a switch for a bathroom exhaust fan installed next to my thermostat. I'd like to use the bathroom fan as a home exhaust fan, using the "free cooling" smart feature of the Ecobee to automatically turn on the fan when the outdoor air is cooler than the inside and it's hot inside.
What's the best way to control a 110V accessory from the ecobee? I think I could buy a 24V/110V relay, and wire the 24V side between Acc+ and C on the thermostat. Then the fan would be wired into the 110V side of the relay.
What relay should I buy for in-wall installation? Is there anything I'm missing here?
(The way it's wired in now, when you flip the switch it also activates the furnace fan, as it's a double-pole double-throw switch. I don't think I'd try to replicate this, I'd let the ecobee decide whether to turn on the furnace fan with the ventilator fan.)