> I could not have been more wrong. After spending a few hours of understanding the setups that "experts" have recommended, I figured out edge cases where they would be either wasteful or uncomfortable (meaning: unnecessary and inavoidable temperature overshoots or undershoots, etc.). I had many-many rounds with Honeywell, Tado, Siemens, etc. and every single one of them had _major_ issues.
Temperature hysteresis is unavoidable with a conventional thermostat, but you can reduce it with PID controllers. Most commercial building automation systems use PID controllers extensively.
My guess is that the residential options from Honeywell, JCI, Siemens, Trane, Carrier, etc are focused more on one-size-fits-all applications, whereas commercial BAS systems are more or less bespoke designs for a specific building (using commodity sensors and controllers). I work with all five of the aforementioned companies on building automation projects, FWIW.
Temperature hysteresis is unavoidable with a conventional thermostat, but you can reduce it with PID controllers. Most commercial building automation systems use PID controllers extensively.
My guess is that the residential options from Honeywell, JCI, Siemens, Trane, Carrier, etc are focused more on one-size-fits-all applications, whereas commercial BAS systems are more or less bespoke designs for a specific building (using commodity sensors and controllers). I work with all five of the aforementioned companies on building automation projects, FWIW.