The ResMed H5i™ Heated Humidifier with Climate Control not only delivers heated humidification, but it allows the user to set the temperature using the Dial Control feature. The H5i™ Humidifier works in conjunction with the ResMed S9™ Series CPAP Machines. The H5i will reduce dry nose/mouth, congestion, and irritation often caused by CPAP therapy. The humidifier produces warm, moist air to make CPAP use more comfortable and relaxed.