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  • What make and model is your existing zone control board? Commented Jan 19, 2020 at 13:49
  • @ThreePhaseEel My zone control board is the Aprilaire 6404 Commented Jan 19, 2020 at 20:42
  • 1
    So two 24V relays, each one thrown by a Nest. Commented Jan 19, 2020 at 22:17
  • BTW: I'm not seeing anything in the Aprilaire 6404's manual about it being able to control a humidifier Commented Jan 20, 2020 at 3:34
  • @Harper-ReinstateMonica How would I do it with two relays? Could you post a solution with an image showing how I'd wire something like that? Commented Jan 22, 2020 at 4:34