A replacement is not complete when the equipment first turns on. The final handoff should document thermostat setup, airflow readings, refrigerant commissioning, condensate drainage, safety checks, filter size, equipment model and serial numbers, and the homeowner's maintenance responsibilities.
Before installation, use the HVAC Quote Checklist to confirm that commissioning is included. Compare the written scope with the HVAC Quote Checker, then review HVAC Hidden Costs for testing, controls, permits, and other items that may be omitted.
Ask for startup documentation and warranty information before making the final payment. Actual procedures vary by equipment and local requirements, so the installing contractor should identify the tests that apply.