Describe the change
Tell Dimitri if the heat feels weaker, the system stops early, or some rooms stay cold. Have the make, model, and any inspection report ready.
Start with accessible checks
Check the thermostat setting, keep return grilles clear, and inspect the filter as directed by the manufacturer. Test carbon monoxide alarms following their instructions.
Plan a professional check
Ask a qualified technician to inspect system controls, airflow, electrical connections, and, for fuel-burning equipment, combustion, venting, and the heat exchanger. Do not adjust gas components yourself.