Furnace Repair in Watertown, WI
Furnaces here run from October through May. If yours quits, tell us what it's doing and a licensed contractor who covers Jefferson County will get in touch.
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Watertown furnaces run eight months a year
October through May, your furnace is what stands between you and a 15 degree night. That is eight months of the burner cycling on and off to hold the house at temperature, and every start puts wear on the igniter and the flame sensor. Eventually one of them quits, and that shows up as short cycling or a furnace that will not light at all.
Most homes here heat with gas, so when the power goes out, the furnace goes out with it even though the fuel is still there. In 2024, 18 percent of Wisconsin households lost power for at least 24 hours. Over the past ten years the area has seen 18 winter storms and 60 damaging wind events, and each one is a chance for the power to go out on a night the furnace needs it most.
- 8 months
- October through May, your furnace is on duty
- 15°F
- the average winter night it heats against
- 67%
- of homes here heat with gas, so most furnaces here burn gas
- 18 winter storms
- in ten years, the nights a failure hurts most
NOAA nClimDiv, 1991–2020 normals
A new furnace would cut about $100 a year off heating for a typical Jefferson County home.
Estimates for a typical Jefferson County home, compared with an older unit built to the previous federal minimum, from EIA household energy data, Wisconsin fuel prices and NOAA climate normals. Your home will differ.
Repair makes sense when one part has failed and the heat exchanger is sound.
Replacement makes sense when the heat exchanger is cracked or the furnace keeps needing parts.
Wisconsin requires contractors to register with the state.
Registration puts a contractor's business on file with the state of Wisconsin. Nobody tested their work to get there, and the state does not hold a trade exam before adding a name to that list. What Wisconsin does add is that no county or city can layer its own HVAC license on top, so the rule in Jefferson County is the same rule as everywhere else in the state, no more and no less.
On a furnace repair, the part that matters most is the gas connection, since a bad one is what makes the job dangerous rather than just imperfect. Registration does not touch that. It confirms the business is on file with the state and nothing more. In Jefferson County, where 67.1% of homes heat with gas, that is the protection this state offers on a job like this.
Sources: Wisconsin Legislative Reference Bureau · Wisconsin Department of Safety and Professional Services
- Why won't my furnace turn on?
- Start with the thermostat. Check that it's set to heat and the setpoint is above room temperature, and swap the batteries if it's gone blank. If the thermostat looks fine, check your breaker panel, since a tripped breaker will cut power to the furnace with no warning lights at all. When neither of those is the issue, the problem is usually inside the furnace itself, in the ignition system or the safety switches that shut it down rather than let it run unsafely, and that calls for a contractor to open it up and test each one.
- Why is my furnace blowing cold air?
- In most cases the furnace hasn't actually started heating yet. The blower often runs for a short stretch before warm air reaches the vents, so air right at startup can feel cool. If it stays cold the whole time the furnace runs, the burners may not be lighting even though the blower is, which points to the igniter or the gas valve. A dirty filter can also choke off airflow enough that the air feels weak and cool by the time it reaches you, so check that first since it's the one thing you can rule out yourself.
- Why won't my furnace pilot light stay lit?
- This usually means the thermocouple has worn out. That's the small sensor that sits in the pilot flame and tells the gas valve it's safe to keep feeding gas to the pilot. Once it wears out, it can't hold that signal, so the valve shuts off the gas and the flame goes out, even though you can relight it every time. A draft blowing across the pilot or a buildup of soot at the pilot opening can cause the same thing, so a contractor will check both before replacing the part.