AC Installation in Green Bay, WI
A new air conditioner in Green Bay will run from July through August every year. Tell us about the house, and a licensed contractor who covers Brown County will get in touch.
Tell us about the job
It takes about a minute.
Green Bay only needs two months of cooling a year
July and August are the stretch, with afternoons averaging 78°F. Your air conditioner does not need to run hard all year the way one further south would. It needs to hold up through those two months and sit ready the rest of the time.
Brown County has seen 29 hail events and 78 damaging wind events over the last ten years, with hailstones up to 2.5 inches. The outdoor unit sits outside through all of that, so where it goes and how it is set matters. Any new unit installed today has to meet 13.4 SEER2, the federal efficiency minimum for central air conditioners built since 2023.
- 2 months
- July through August, your air conditioner is on duty
- 78°F
- the average summer afternoon it cools against
- 29 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 $10 a year.
Estimates for a typical Brown 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, nothing more. Nobody tests the contractor's work before handing that out, and Wisconsin doesn't let Brown County or any city add a license requirement on top of it, so this is the only state record that exists here.
The protection on an air conditioner install comes from somewhere else. In most cities and counties, a job like this needs a permit from the local building office, with an inspection once the work is done, and that inspection is what checks the installation here.
Sources: Wisconsin Legislative Reference Bureau · Wisconsin Department of Safety and Professional Services
- What size air conditioner does my house need?
- It depends on your square footage, how much shade and sun your house gets, your insulation, and how many windows you have, so there's no single number that fits every home. A contractor works this out with a load calculation, not by measuring the house alone. Going bigger than what the calculation calls for isn't a safety net either. An oversized unit cools the air fast and shuts off before it pulls the moisture out, so the house feels clammy even though the thermostat says it's cool. A contractor can run the numbers for your house and tell you the right size.
- Should I replace the whole system or just the outdoor unit?
- In most cases the whole system needs to go together, not just the outdoor unit. The outdoor condenser and the indoor coil are matched to work at a specific capacity and efficiency, and pairing a new condenser with an old coil usually means the system never reaches the rating it was built for. It can also void the manufacturer's warranty on the new equipment. If your indoor coil and furnace or air handler are old too, a contractor will likely tell you they need to come out at the same time as the condenser.
- Do HVAC contractors in Green Bay need a state license to work on my home?
- Wisconsin doesn't issue a trade license for HVAC work, but contractors are required to register with the state's Department of Safety and Professional Services. Ask to see that registration before work starts. It's a basic way to confirm you're dealing with a legitimate contractor rather than someone working off the books.