Furnace maintenance and tune-ups in Sheboygan County.

Once a year, every year, for the life of the furnace. In a Wisconsin heating season a furnace runs an enormous number of hours, and almost everything that goes wrong with one develops gradually — a sensor fouling, a burner drifting out of tune, a motor drawing more current each season. Annual service is what turns those into small line items instead of no-heat calls.

September or October, before the first hard freeze. There are two reasons. First, anything we find is a scheduled repair rather than an emergency, and parts are easy to get. Second, availability — once the cold arrives, every heating contractor in the county is triaging no-heat calls and a routine tune-up moves to the back of the queue. If you are reading this in January, still book it; just expect to wait.

A real tune-up includes combustion analysis at the flue, measured temperature rise, static pressure across the system, a cleaned and tested flame sensor, an igniter resistance reading, a heat exchanger inspection, amp draw on both motors, capacitor testing, tightened electrical connections, a cleared condensate trap and drain, vent and termination inspection, safety switch testing, gas pressure verification, and a thermostat check. You should get numbers back, not just a checkmark.

Budget about an hour for a typical residential furnace. Less than that and something on the list got skipped. Longer is normal if the equipment is older, access is awkward, or we find something that needs a proper look.

Check your registration paperwork — manufacturers commonly expect documented annual maintenance for parts coverage to stay in force, and a denied claim years later is an expensive way to find out. Keeping a dated service record costs you nothing and protects you either way. We leave documentation after every visit.

Either works, as long as the visit actually happens — the failure mode is not the plan, it is the year everybody forgets. The Comfort Club, our maintenance plan, means we remind you every year, keeps the service history in one place, and takes $10 off a furnace and air conditioner tune-up, with no contract. Here is how it works.

You can and should do the filter, the return grilles and the vent terminations — those three account for a real share of the problems we get called about. What you cannot do at home is the measurement: combustion analysis, static pressure, temperature rise, amp draw and gas pressure all need instruments, and those are the readings that find problems before they find you.

Yes, and arguably more than an old one did. Modern high-efficiency furnaces have condensate drains that clog, pressure switches that are sensitive to vent restriction, variable-speed motors and control boards that mind their power supply, and tighter combustion tolerances. There is more on a new furnace that benefits from being checked, not less.

We tell you what it is, what it will cost, and how urgent it actually is — and we separate those three things honestly. Plenty of findings can wait until spring, and we will say so. The exception is a cracked heat exchanger or an unsafe combustion reading: that furnace gets shut down on the spot, because it is a carbon monoxide risk rather than an efficiency one.