Mini Split Installation in Green Bay, WI
A new system here will heat from September through May and cool 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.
What a mini-split in Green Bay is up against
Your mini-split has work to do here for 11 months of the year, heat from September through May and cooling in July and August. Winter nights average 14°F, so the heat pump has to keep pulling warmth out of air that cold most of the season. Summer is short and the afternoons only average 78°F, which is a lighter load than the winter side carries.
Any new mini-split installed now has to meet the federal minimum for split-system heat pumps, 14.3 SEER2 for cooling and 7.5 HSPF2 for heating. In a climate where the heating season runs this long, the HSPF2 rating matters more than the cooling number, since that is the side of the unit doing most of the work.
- 9 months
- September through May, your system heats
- 2 months
- July through August, it cools
- 14°F
- the average winter night it heats against
- 78°F
- the average summer afternoon it cools against
NOAA nClimDiv, 1991–2020 normals
Wisconsin requires contractors to register with the state.
That registration puts a contractor's business on file with the state. It does not mean anyone tested their work, and it is not a license. Wisconsin also does not let counties or cities layer their own HVAC license on top, so in Brown County that registration is the whole of the state's paperwork on a contractor, nothing more and nothing less.
For a mini-split installation, the protection that matters comes from the local building office rather than the state. In most cities and counties, putting in a mini-split needs a permit, and an inspection once the work is done. That inspection is what checks the installation itself, the lines, the mounting, the wiring, not the registration.
Sources: Wisconsin Legislative Reference Bureau · Wisconsin Department of Safety and Professional Services
- Is a mini split worth it?
- For the right room or addition, yes. A mini split cools in summer and heats in winter without any ductwork, so it works well in a room that never got comfortable before, like a bonus room over a garage or a finished basement. Down to 14°F on a January night, a cold-climate mini split is still worth looking at here, since winters run well below freezing for months. If gas heat already reaches the room, a mini split is less about replacing that and more about covering a space the furnace does not.
- How many rooms can a mini split cover?
- One outdoor unit can run one indoor head or several, depending on the system. A single-zone system covers one room or open area. A multi-zone system splits the output across several indoor heads, each with its own thermostat, so a bedroom and a living room can run at different temperatures off the same outdoor unit. How many zones a house can support comes down to the size of the outdoor unit and the layout of the home, which is something a contractor sizes room by room.
- Can a mini split heat a whole house?
- It can, if it is sized and placed for that. A multi-zone mini split with a head in each main room can heat an entire house the same way a furnace does, and cold-climate models are built to keep working at the low temperatures this area sees, down to 14°F on an average winter night. Most homes here already heat with gas, so a whole-house mini split usually comes up when someone is replacing that system entirely rather than adding to it. Either way, the sizing has to account for every room, not just the biggest ones, and that is a job for a contractor walking the house.