I have a furnace with an ancient Freshmist 90 attached - it's so caked with hard water deposits it doesn't work (it was like this when we moved into the house).
It seems the Aprilaire is the way to go, and I'm wondering how straightfoward it would be for me to replace the 90 with an appropriate Aprilaire (for a 3800 sq ft house). Is this something I could do myself?
Many thanks for advice!