I'm curious, my coworker mentioned how dry his house is and I said I had the same problem until I installed a whole house unpowered humidifier that is attached to the heating system. I believe it is attached at the return ductwork and has a duct that sprays water particles on the supply after the heat exchangers.
Another coworker mentioned that it is a common problem to have gas furnace parts rust out, including the heat exchanger because of the humidifier. He said it is more common with high efficiency furnaces. He mentioned that is why he has a couple of portable humidifiers in the home to avoid this problem. I called BS on his assertions.
I'm curious, have any of you pros ever heard of this problem? It sounds odd to me. I mean I believe they've been installing whole house humidifiers attached to supply and return vents for years. In fact many of the major heating and cooling companies like Carrier, Trane, Amana, American Standard all sell humidifiers on their site.
Maybe I missed something, but I'm curious to know if any pros or amatuers have heard of this or seen damaged furnace parts due to humidifiers causing rust.