Getting your heating system ready for fall
A short, safe checklist to run before the first cold night—while there is still time to deal with a problem.
Run the system before you truly need it. Confirm the thermostat responds, check the filter and registers, look at the exterior vents from the ground, and pay attention to new sounds or smells. Stop if anything seems unsafe.
Try it before the first cold night
Set the thermostat to HEAT and raise the setting a few degrees above room temperature. Give the system time to respond; different equipment starts in different ways. Confirm that warm air or heat reaches the home and that the thermostat display remains normal.
This is a function check, not a diagnosis. There is no reason to remove panels, bypass switches or relight equipment unless the manufacturer’s instructions specifically assign that task to the homeowner.
Five things you can check safely
Replace thermostat batteries if the display is blank or weak. Check the forced-air filter and use the size and type specified for the system. Make sure supply registers and return-air grilles are open and unobstructed. From the ground, check that exterior intake and exhaust openings are not blocked. Listen for a sound that was not present last season.
When to stop
If you smell gas, see smoke, hear a CO alarm or believe the equipment is unsafe, leave the building and call 911 from outside. For a non-emergency problem—no start, poor heat, repeated cycling or a new noise—turn the system off if needed and arrange service.
What a service appointment checks
A proper service appointment goes beyond this homeowner check. It gives a technician access to the equipment for cleaning and a visual review of operational and safety-critical components. Required testing for applicable equipment may be separate.