HVAC Repair in Hudson, WI
Homes here need heat from September through May and cooling from June through August. If your system quits, tell us what it's doing and a licensed contractor who covers St. Croix County will get in touch.
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Nine months of heat, three of cooling, and nights near zero
Your furnace in Hudson works from September through May. On winter nights that average 9°F, it runs long and often, and the igniter and blower motor take the wear. When the igniter finally goes, the furnace won't light at all, and you find out at the worst possible time.
Summer asks less of the system here, three months of afternoons near 79°F, but the air conditioner still has to keep up during that stretch. Wisconsin sees its share of hard weather too, winter storms and damaging wind both show up most years in St. Croix County, and either one can knock out power or strain a system that was already due for a repair.
- 9 months
- September through May, your system heats
- 3 months
- June through August, it cools
- 9°F
- the average winter night it heats against
- 79°F
- the average summer afternoon it cools against

NOAA nClimDiv, 1991–2020 normals
A new furnace and air conditioner would cut about $130 a year off heating and cooling for a typical St. Croix County home.
Estimates for a typical St. Croix 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.
Replacement makes sense when the furnace's heat exchanger is cracked, the air conditioner's compressor has failed, or repairs keep coming.
Wisconsin requires contractors to register with the state.
That registration puts the business on file with the state. It does not mean anyone tested the contractor's knowledge of furnaces, air conditioners, or gas lines. Wisconsin also keeps this uniform. Counties and cities cannot layer on their own HVAC license, so the registration is the same wherever in St. Croix County you are.
For a repair like this, the registration is what exists. Wisconsin does not add a trade exam or a state license on top of it, and no county rule fills that gap either, because the state does not allow one.
Sources: Wisconsin Legislative Reference Bureau · Wisconsin Department of Safety and Professional Services
- Why is my heat not working?
- Start with the thermostat. Check that it is set to heat and the temperature is set above room temperature, and check the batteries if it has a screen that looks dim. If the thermostat is fine, check your breaker panel for a tripped breaker, since a furnace that lost power will not ignite. Gas furnaces also have a flame sensor that dirties over time and will shut the burner off as a safety measure, and a filter clogged enough to choke airflow can trip a high limit switch and stop the heat before it starts. Winter nights here average 9°F, so if these checks do not bring the heat back, call a contractor rather than wait it out.
- Why is my system running but not cooling the house?
- If the blower is running but the air is not cold, check the filter first. A filter packed with dust blocks airflow across the indoor coil, and when that happens the coil can ice over and stop cooling the air even though the fan keeps moving it. Next check the outdoor unit and clear away any grass clippings, leaves or mulch stacked against it, since it needs open air around it to shed heat. If the filter is clean and the outdoor unit is clear and you are still getting warm air, the system likely needs refrigerant or has an electrical fault, and that calls for a contractor with gauges and a meter.
- What can I check before calling for HVAC repair?
- Check the thermostat settings and battery first, since a wrong setting or a dead battery looks exactly like a broken system. Check the filter next and replace it if it is gray or thick with dust, because a blocked filter can cause both a furnace and an air conditioner to underperform or shut off. Check your breaker panel for anything tripped, especially after a storm, since this area has seen 28 damaging wind events and 30 winter storms over the past ten years, and either can knock out power to a system. If you have a gas furnace, check that the gas valve is turned to on. If all of that checks out and the system still is not doing its job, the problem is inside the equipment and a licensed contractor needs to look at it.


