Profile: Phoenix Plumbing, Air Conditioning & Heating Repair is specialized in air conditioning repairs, air purification systems, sewer & drain cleaning, water heater repairs, pressure regulators, plumbing valve repairs, heating repairs, sink & faucet plumbing repairs, water gas leak detection, disposal repairs, pipe & hose leak repairs and appliance repairs. Warm-mist units are designed to solve some humidifier maintenance problems. Before being dispersed, the reservoir water is heated. This distills out minerals and kills bacteria and molds. The heated water is then combined with filtered air to create a warm, but not scalding, mist. Unlike old-fashioned steam vaporizers, which could cause bad burns, these warm-mist units are not dangerously hot to the touch.