It’s based on run time of the system, not actual days, so if you have a 3 month filter and the system is only running 3 months a year, it will only ask you to change it once a year. If your old system was based on actual days, you will need to adjust how long of a time you put in for the filter change.
From day one of this thermostat release, my filter % still at 0 no matter of hours of run time. I have it set to a month for testing too.
Will it ever work? Anyone got theirs to work?