Traditional thermostats do an acceptable job when every resident is disciplined about settings. Real life looks different. People leave for work, forget to adjust temperatures, and run systems hard during peak hours. Even small inefficiencies multiply across dozens or hundreds of units.
Smart thermostats apply schedules, occupancy logic, and remote controls to keep temperatures within a comfortable range while trimming waste. That is where smart thermostat savings begin. They also provide data that informs maintenance timing and equipment upgrades, which keeps long-term costs under control.