Ouch, with a brother that used to work in HVAC and myself having lived in two houses that formerly had working humidifiers piggy-backed onto furnaces - a word of caution - they're tough to keep from molding and they rust ductwork making it nearly impossible to clean.

This place I've got 3 runs of "tin" to replace due to that farking thing. Get a guitar humidor!

Bren R.