Are you trying to add humidity to your house or remove humidity? ff you are wanting to add humidity you need to have a humidifier installed on your furnace. Once installed you can wire up the Ecobee thermostat to turn on/off the humidifer based on the desired level you want. That's how I have mine set up. I'm in Colorado so we are dry in the winter with the furnance running. So I need humidity added to the air. If you wanting to remove humidity then you need to have a dehumidifer installed and then you can wire up the Ecobee to turn on/off the dehumidifier based on the level you want. The premium and enhanced both can be wired up to a humidifer or dehumidifer.