We have installed a generalaire power hum. We are having a problem with getting the humidity up past 35% even with the humidistat cranked. The unit is mounted on the supply side of a high eff. furnace. The furnace is an upflow, but 90's back down through the floor into a crawl space. The return is under the floor in crawl space. This is the reason we opted for the power model,so we did not have to connect a bypass to the return under floor.(no room for 6" bypass.)
If anybody has any input that would be great.