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Maintenance · Sep 2026

Your fall furnace checklist

Five things to do before the first hard freeze.

1. Change the furnace filter — a clogged filter is one of the most common causes of poor heat.

2. Test your carbon monoxide and smoke alarms, including in the garage if you have a gas heater.

3. Check that the outdoor intake and exhaust vents are clear and plan where snow will be piled.

4. Turn the heat on before you need it to make sure everything works.

5. Book a professional tune-up so combustion, safety controls and the heat exchanger are checked.

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