Supply or return, where should my humidifier be located?

Consumer question:

The furnace is a high efficiency heat pump. The humidifier is installed on the supply plenum with the bypass running to the supply plenun. Is this optimal for energy conservation or would the reverse be better? This is for the Aprilaire Humidifier model 440.

Aprilaires’ response:

Thank you for contacting us regarding your humidifer. The unit can function equally well on both the supply and return side. The air flow will always be going from the supply to the return and will provide for excellent evaporation.

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