Reply To: Humidifier Home › Forums › Decaffeinated Coffee › Humidifier › Reply To: Humidifier October 27, 2010 2:04 pm at 2:04 pm #704922 tomim tihyeMember About ten years ago, Dr. Shanik (Lakewood) told me that warm-mist humidifiers are breeding places for bacteria; he recommends cool-mist.