Surveyed home for whole house humidifier. Customer has boiler for heat and 2 separate air handlers for AC. One of the air handlers is in the basement and the other air handler is in the attic. We can only attach a humidifier to the basement air handler due to the fact we can’t bring water up to the attic in an unconditioned space because water could freeze and there is no way to bring water up there anyway. I would recommend a power vent humidifier or steam humidifier depending on what is better for larger square footage of the home. The first floor will be the only floor we can condition with the humidifier and the first floor is at least 2,500-3000 square feet. Will turn lead over to Steve to handle from here on out.