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On what side of the furnace do I install the tank of the humidifier (the warm side or the return air side)?

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What type of humidifier? What manufacturer/model? Have you consulted the manufacturer's documentation? – gregmac Jan 9 at 23:39

2 Answers

All the humidifiers I've seen mount on the return plenum and have a duct installed that bypasses the air handler to the supply plenum.

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I've had two different whole-house humidifiers, both humidified the return (intake) side of the system, but in two different ways. One was a rotating disc system, which mounted on the bottom of the ceiling-mounted return; the discs rotated into the water and then up into the airflow. In our current house, the unit is mounted on a vertical surface of the hot side, and has a small pump that dribbles water down over a replaceable element; hot air from the supply side blows over the element it and back into the return duct through a small bypass duct.

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