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I just got my ecobee3 installed and I decided that I wanted to run my humidifier off of it. I only have 18/4 wire running down to the furnace so I will need to run a new length of 18/5 cable. My question is since I will have enough wires I have options on how to run the humidifier, would it be better to wire the humidifier's solenoid valve up as not externally powered (acc+ and acc-) or externally powered (acc+ and com)?