Furnace Installation in Oshkosh, WI
A new furnace here will run from October through May every year. Tell us about the house, and a licensed contractor who covers Winnebago County will get in touch.
Tell us about the job
It takes about a minute.
Eight months of heat asks a lot of a furnace
In Oshkosh, a furnace runs from October through May. That is eight months of the year, with winter nights averaging 13°F. A new furnace here is not a seasonal appliance. It is on more than it is off.
Most homes in the area heat with gas, and any non-weatherized gas furnace installed today has to reach at least 80 percent AFUE. That is the federal floor, not a ceiling, and it is worth asking what efficiency the unit going into your home actually hits. Winnebago County has also seen its share of winter storms and high wind events over the past ten years. When the power goes out along with the cold, a furnace that starts back up on its own once power returns matters.
- 8 months
- October through May, your furnace is on duty
- 13°F
- the average winter night it heats against
- 72%
- of homes here heat with gas, so most furnaces here burn gas
- 80% AFUE
- the federal minimum any new unit must meet
NOAA nClimDiv, 1991–2020 normals
A high-efficiency gas furnace would save about $100 a year to run in Winnebago County compared with a gas furnace.
Estimates for a typical Winnebago County home, from EIA household energy data, Wisconsin fuel prices and NOAA climate normals. Your home will differ.
Wisconsin requires contractors to register with the state.
Registration puts the business on file with the Department of Safety and Professional Services. It does not mean anyone was tested. There is no state trade exam behind the name on the record, and Winnebago County cannot layer its own HVAC license on top since counties and cities are barred from doing that here.
For a furnace install, the protection comes from the permit, not the registration. Most cities and counties require a permit for a furnace replacement and an inspection once the work is done, and that inspection is what catches a bad gas connection, which is the part of this job that can hurt someone. Gas heat runs most homes in Winnebago County, so that inspection is doing real work here, not a formality.
Sources: Wisconsin Legislative Reference Bureau · Wisconsin Department of Safety and Professional Services
- What size furnace does my house need?
- It depends on your home's square footage, insulation, window count, and layout, so there's no single number that fits every house. A contractor sizes it with a load calculation, not a chart based on square footage alone. Too big and it short cycles, wearing out parts faster and leaving rooms uneven. Too small and it runs constantly through the cold nights here without keeping up. With winter lows averaging 13°F, getting this right matters more than it would somewhere milder.
- How do I know it's time to replace my furnace?
- Age is the first thing to check. As a furnace gets older, repairs get more frequent and the risk of a breakdown on a cold night goes up. Watch for rising gas bills with no other explanation, rooms that heat unevenly, or a burner flame that's yellow instead of blue. Homes here need heat from October through May, so if your furnace is old and a repair keeps failing, that's a sign to stop patching and start planning a replacement.
- Is a high-efficiency furnace worth it?
- It depends on how many months your furnace runs and what your current one costs to operate. Homes here need heat for 8 months of the year, so a furnace works harder and longer than it would in a milder climate, which is where higher efficiency pays off most. Any new non-weatherized gas furnace has to meet 80.0 percent AFUE by law, and high-efficiency models go beyond that. A contractor can walk you through the difference in installed cost against what you'd save given how much your furnace actually runs.