Warm and Cool Mist Ultrasonic Humidifier Disperse warm and cool mist throughout your living spaces to create a soothing atmosphere at home with the LEVOIT Hybrid Ultrasonic Humidifier. Got a cold or the flu? The warm, soothing mist helps eliminate most germs/bacteria, viruses, mold spores, and mineral dust around your living spaces. If you have trouble sleeping at night, the cool mist will alleviate congestion or a cough by keeping your throat and nasal passages hydrated. Moisturize your skin and reduce static electricity in your home with the cool mist function.