how often to service furnace

[MacDelilah]

Furnaces should be serviced at least once a year, ideally in the fall before winter, to ensure efficiency and avoid costly breakdowns. For older units or those in heavy use, some experts recommend biannual checks. A professional tune-up can catch minor issues, improve air quality, and extend the furnace’s lifespan, while air filters should be replaced regularly every 1–3 months.