Filters and airflow
Inspect accessible filters regularly and replace them according to the filter and system needs. Keep vents open and unobstructed.
Observe startup and operation
Changes in startup, cycling, odor, sound, or heating performance can be useful early warning signs. Do not open combustion or electrical areas to investigate.
Professional inspection
Heating equipment includes safety and combustion considerations that make professional inspection appropriate for tasks beyond basic homeowner care.
Safety note: If you smell gas, see smoke or fire, suspect carbon monoxide, or believe there is an immediate safety danger, leave the area as appropriate and contact the relevant emergency or utility service. Do not treat an active safety emergency as a routine HVAC appointment.