Humidifiers and Dehumidifiers - Honeywell HE220A install

I just purchased a Honeywell HE220A and plan to install it in the next week or two. I've read a lot of the discussion on this forum, and had a couple questions.

The forum generally states that it is best practice to mount the humidifier on the cold air return duct instead of on the hot-air supply. This makes sense because of the possibility of water problems potentially destroying the furnace. Why, then, does the manufacturer recommend installing the humidifier on the hot-air supply? Are there any advantages to mounting it on the hot-air supply instead of the cold-air return?

Thanks for any assistance you can provide!

I just purchased a Honeywell HE220A and plan to install it in the next week or two. I've read a lot of the discussion on this forum, and had a couple questions.

The forum generally states that it is best practice to mount the humidifier on the cold air return duct instead of on the hot-air supply. This makes sense because of the possibility of water problems potentially destroying the furnace. Why, then, does the manufacturer recommend installing the humidifier on the hot-air supply? Are there any advantages to mounting it on the hot-air supply instead of the cold-air return?

Thanks for any assistance you can provide!

Pretty simple. Hot-air supply will enhance evaporation and so provide greater capacity for humidified air. If you have a very large area go with hot-air supply. If your space is smaller (generally < 2000 sq ft) cold-air supply will suffice.

I thought that because of the pressure difference between the hot air supply and cold air return the air flow would always go from the hot air supply through the humidifier to the cold-air return, regardless of which side the humidifier was on. Is that true? If so, it shouldn't matter what side the humidifier was on.

Thanks for your assistance.