Follow the symptom from thermostat to equipment
For Rosemont service, note whether the thermostat display is active, whether the fan runs and whether heating and cooling behave differently. This gives a clear starting point without requiring a homeowner to test live electrical components.
If the system works intermittently, record when it stops and whether the thermostat still calls. A repeatable description is more useful than replacing a thermostat solely because the room feels uncomfortable.
For ac installation & replacement, bring intermittent operation and controls into the scope discussion. Compare conventional AC replacement with a suitable heat-pump alternative where both meet the building's needs. Evaluate the complete installed scope, electric service requirements and current incentives separately from the advertised efficiency rating.
