Heating Maintenance That Helps Your System Stay Ready When It Matters

September, before the first hard freeze arrives in early to mid October. A furnace that has been off since spring is exactly when a weak igniter, a fouled flame sensor or a failing inducer motor shows itself. Scheduling the visit ahead of the first cold snap means the fix happens on your calendar instead of during the busiest week of the season.

A proper tune-up inspects the heat exchanger for cracks, cleans the burners and flame sensor, checks the igniter, verifies gas pressure and combustion, inspects the flue and combustion air, tests the limit and pressure switches, checks blower condition and amp draw, confirms thermostat operation and measures temperature rise across the unit.

Change the air filter on schedule and use one in the MERV 8 to 13 range unless the system was designed for more. Keep supply and return registers open and unblocked, vacuum dust from return grilles, and clear snow, leaves and nests away from exterior intake and exhaust vents. Leave burners, gas and the heat exchanger to a licensed technician.

It lowers the odds; it does not promise a winter without a service call. A heating tune-up catches the common wear items, a fouled flame sensor, a cracking igniter, a noisy inducer motor or drifting gas pressure, and keeps the furnace running at the efficiency it was set up for. It cannot make a cracked heat exchanger safe or turn a twenty-year-old furnace into a new one.

No. Combustion and venting testing during a heating tune-up confirms the furnace is operating safely on the day of the visit, which is a snapshot rather than continuous protection. A flue can block with a nest or drifted snow, and a heat exchanger can fail between visits. Working carbon monoxide alarms on every level, tested and with current batteries, are what protect the house the rest of the year.