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The HC604 Thermosmart CPAP Machine uses patented heated coil tubing to eliminate rainout and will automatically adjust to deliver the exact amount of humidification you need as you sleep. This is like the most advanced, high end humidification system in the world. ThermoSmart Technology, with its heated breathing tube adapted from sophisticated intensive care humidification, delivers higher and customized humidity levels that are maintained throughout the night, regardless of ambient temperature change. It results in optimal sleep performance due to higher comfort levels leading to improved patient acceptance and compliance. Costs $449.00 at cpap.com but I think it's well worth the money considering it's a cpap humidifier that combines a computer chip and a heated hose to deliver the greatest absolute humidity.