Mini Split Installation in Wausau, 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 Marathon County will get in touch.
Tell us about the job
It takes about a minute.
What a mini-split in Wausau has to handle
Winter nights here average 9°F from December through February, and a mini-split has to keep pulling heat out of that cold air the whole time. Summer only asks for two months of cooling, July and August, with afternoons around 78°F. The other nine months, September through May, the unit is running for heat. That is 11 months a year with the compressor doing something.
A mini-split built for this has to be sized and installed for the low end, not the mild days. Any unit sold new has to meet 14.3 SEER2 for cooling and 7.5 HSPF2 for heating, since a ductless heat pump falls under the same federal minimum as any other split system. Marathon County has also seen 33 winter storms and 82 damaging wind events over the past ten years, and power does go out. A mini-split needs the power on to run, same as the furnace it may be replacing.
- 9 months
- September through May, your system heats
- 2 months
- July through August, it cools
- 9°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.
Registration puts the business on file with the Department of Safety and Professional Services. It does not mean anyone tested the contractor's work, and there is no trade exam behind it. Wisconsin also keeps this the same everywhere in the state. Counties and cities cannot add their own HVAC license on top, so the registration is the same in Marathon County as anywhere else in Wisconsin.
For a mini-split install, the permit is what stands in for that missing exam. Most cities and counties require one for this kind of installation, along with an inspection once the work is done, and that inspection is what checks the job was done right. That check comes from the local building office, not from the state.
Sources: Wisconsin Legislative Reference Bureau · Wisconsin Department of Safety and Professional Services
- Is a mini split worth it?
- For most homes it comes down to what room or space needs help that the main system does not reach. A mini split heats and cools that space directly, so a bedroom over a garage or a finished basement that runs cold in winter can get its own comfort without extending ductwork. Winter nights here drop to 9°F on average, so a mini split chosen for this area needs to be rated for that kind of cold. A contractor can look at the space and tell you whether a mini split solves the actual problem or whether something else fits better.
- How many rooms can a mini split cover?
- A single outdoor unit can run one indoor head or several, so the answer depends on the system, not on mini splits in general. A single-zone system covers one room or open area well. A multi-zone system ties several indoor heads to one outdoor unit, with each head sized for the room it serves. Add too many rooms onto one outdoor unit and each zone loses capacity, so a contractor sizes the system to the rooms you actually want covered.
- Can a mini split heat a whole house?
- It can, but it takes the right number of zones placed where the house actually loses heat, not just one unit in the living room. Homes here need heat from September through May, nine months of the year, with winter nights averaging 9°F, so a whole-house mini split setup has to be sized for that cold, not for a mild day in the shoulder months. A contractor can walk the house room by room and lay out how many zones it would take to heat all of it.