Hi!
I've had a new Carrier furnace and humidifier installed a couple of years ago. Things are working great, but I am somewhat concerned that the humidity isn't being properly adjusted. It seems like it's really all over the spectrum. I can adjust the humidistat to 45%, and I will see 20% humidity inside. Or, I can adjust it to 5% on the humidistat, and get 20% still. I know that it's working sometimes though because the filter is wet with water.
I'm wondering, does it matter where the humidistat is mounted? They mounted it on one of the furnace intakes on the outside. It looks something similar to the picture on this page, but a little newer. ;-)