Found by trial no error...
This sounds foolish but it isn't. Seven years running...
When bedroom temps drop to <60F. The machine gets a dish towel draped over the humidifier section. A manufacturer recommended insulator for the flex hose.
Result? -65% reduction in ampere hours for humidifier. The heating disc SYSTEM has three separate fail-safes (Respironics). And I used a lab grade thermal measurement system with loud audio alert.
Medical UL is a different animal than standard UL. Expensive components and design.
Do your own test during the DAY, and check machine temp by hand.
And OF COURSE the manufacturer would NOT recommend this.
Unfortunately humidification is an absolute necessity for me. Maxxed out on 5, and even that wasn't enough so a hose insulation and humidifier insulation was needed. On forty degree nights, the machine gets covered by blankets.
Scared? Go online and buy a battery powered temp alarm.