My buddy Dave used hot tap water for a week because he thought it would steam his plants like a spa day. His humidifier started growing what looked like a tiny science experiment. He called it “Project Slime.” I called it a hazard.
And then there’s my neighbor, who once used boiling water directly. The plastic tank warped and hissed like an angry cat. We laugh about it now, but at 3 AM, it wasn’t funny. Don’t let your humidifier audition for a horror movie.