I read a study on the humidity levels reached at the mask for several heated humidifier systems. The net was the humidity level didn't get to the specified setting until about one hour after the start.englandsf wrote:Finally tried 6-7 fake reusable ice cubes in my S9/H5i set up last night with humidity on 2 and Climate Line/Heat off. The slightly cooler air was nice but it was also significantly drier - so caused some extra congestion. Overall, not worth it as the congestion was more unpleasant than the cooler air was pleasant. Net fail.
So, if you placed some actual frozen distilled water cubes in the chamber you might be able to get 20 or 30 minutes of cool air before the humidifier overcame the lower temperature. I suspect that it wouldn't take much to give the effect but also melt in time to give you the level of humidity you need.
Alternatively, you could keep your distilled water in the fridge and try mixing some with room temperature to get various temperatures to see how long the cool effect would last.
Just a thought about how to design an experiment.