AquaCool does not heat Essential Oils and keeps their holistic properties in tact. Once oil is diffused into the air the aromatherapy benefits of the fragrance is released as a pleasant, subtle scent that lifts moods while delivering healthful benefits. Transform your home from an arid dessert into a cool and refreshing oasis! AquaCool helps reduce irritation from dry coughs and stuffed sinuses. Ultrasonic action creates negative ions that helps purify the air while running whisper-quiet and does not interfere with a nights sleep. It's the environmental solution to the problem of a home's dry air from forced air heat.