Temperature adjustments are simple with the large up-down arrows The temperature can be set differently for heat and cool, if desired Display shows both heating and cooling setpoints and room temperature simultaneously The display can be either Fahrenheit or Celsius For heat pump models, energize reversing valve with "B" or "O" terminal

Operation of the thermostat is annoyance free:

Autochangeover is standard Fully electronic means no "droop" for better comfort The display is backlit with large numbers so it’s easy to read in dark hallways Energy saving smart fan (commercial model) Programmable fan (residential model)

Plus these bonuses:

5 minute compressor protection is standard, and adjustable cycle limits, both overrideable for servicing equipment Meets Title 24 Residential and Commercial Requirements in California Two color LED [green is cool, red is heat] Thermostat locking Proven reliability backed by the world’s largest manufacturer of air conditioning and heating equipment

Commercial models add:

Battery-less operation with 48 hour clock backup and a "NeverlostTM" program Soft start -- up to 100 units can be started in sequence (P374-2300FM) 3 Security levels including setpoint limiting Adjustable setback override timer - max. 4 hours (P374-2300FM)