AC Installation in Oshkosh, WI
A new air conditioner in Oshkosh will run from June through August 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.
Three months of real heat, then it stops
Oshkosh only asks a new air conditioner to work June through August. Summer afternoons average 80°F, which is warm enough to run a system hard but not the kind of heat that pushes equipment to its limit day after day. A properly sized unit spends most of the year sitting idle.
The bigger risk here is what comes with the storms. Winnebago County has seen 54 damaging wind events and 16 hail events over the past ten years, with hail up to an inch across. That kind of weather is hard on an outdoor condenser, on the fins and the coil especially. Any new system installed here needs to meet the federal minimum of 13.4 SEER2, and it helps to have it set up by someone who accounts for what the weather does to the unit sitting outside your house.
- 3 months
- June through August, your air conditioner is on duty
- 80°F
- the average summer afternoon it cools against
- 16 hail events
- in ten years, and hail bends the fins on outdoor coils
- 13.4 SEER2
- the federal minimum any new unit must meet
NOAA nClimDiv, 1991–2020 normals
Going above the federal minimum saves little here, about $20 a year.
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.
That registration puts the business on file with the state. Nobody tested the contractor's work, and Wisconsin doesn't run a trade exam to get on that list. Counties and cities in Wisconsin can't add their own HVAC license on top of it, so this state record is the only one that exists here, no matter where in Winnebago County you are.
For an air conditioner installation, the protection comes from elsewhere. The job should get a permit from the local building office, with an inspection once the work is done, in most cities and counties. That inspection is what checks the installation was done right, not the registration.
Sources: Wisconsin Legislative Reference Bureau · Wisconsin Department of Safety and Professional Services
- What size air conditioner does my house need?
- The right size depends on your square footage, your windows, your insulation, and how much shade your house gets, so there is no number to give without a look at the house itself. A contractor works this out with a load calculation, not a chart based on home size alone. Going too big is as much a problem as going too small. An oversized unit cools the air fast but shuts off before it pulls the humidity down, so the house feels clammy even at the right temperature.
- Should I replace the whole system or just the outdoor unit?
- If your indoor coil and furnace are old, replacing only the outdoor unit usually causes problems rather than saving you from them. The outdoor unit and the indoor coil are matched to work together, and pairing a new one with an old one can mean the system never runs at the efficiency it is rated for. If the indoor coil is also near the end of its life, replacing both at once means the work only has to happen once. A contractor can look at both halves and tell you whether they are still a fair match.
- Do HVAC contractors in Oshkosh need a state license to work on my home?
- Wisconsin requires HVAC contractors to register with the state through the Department of Safety and Professional Services. This is a state-level registration, not a local city license, so it applies no matter where in Wisconsin the work is done. Ask to see proof of it before work starts on your home.