Use a steady schedule
Large setbacks can create difficult afternoon recovery in a hot, humid home. A smaller adjustment while away may be more comfortable and easier on equipment.
Pay attention to humidity
If the temperature looks acceptable but the house feels sticky, the system may be oversized, airflow may be low, or it may not run long enough to remove moisture.
Treat constant run time as information
Long run time during extreme heat can be normal, but a system that never reaches the setpoint, freezes, leaks, or leaves rooms uneven should be evaluated.
Check the thermostat location
A thermostat near a supply vent, sunny window, kitchen, or draft can read differently from the rest of the home. Location can affect cycling and comfort decisions.
Use comfort measurements
Room temperature, humidity, airflow, and run time tell a better story than a setpoint alone. If the system cannot maintain the home, the equipment and distribution system need evaluation.