Mini Split Installation in Hudson, WI
A new system here will heat from September through May and cool from June through August every year. Tell us about the house, and a licensed contractor who covers St. Croix County will get in touch.
Tell us about the job
It takes about a minute.
Nine months of heat, three of cooling, and a cold that tests the unit
Winter nights in Hudson average 9°F from December through February. A mini-split has to keep pulling heat out of air that cold for months at a time, not just on the worst night of the year. It runs September through May, nine months of the year, then switches over and covers the three summer months when afternoons average 79°F. That is a year-round load with almost no break.
Any mini-split installed new has to meet the federal minimum for a split-system heat pump, 14.3 SEER2 for cooling and 7.5 HSPF2 for heating. That covers the mild days. What decides how the house feels on a 9°F night is whether the unit was sized and installed to keep delivering heat when the air outside is that cold, not just rated to.
- 9 months
- September through May, your system heats
- 3 months
- June through August, it cools
- 9°F
- the average winter night it heats against
- 79°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. Nobody tested this contractor to get there. There is no exam behind the paperwork, just a record that the business exists. Wisconsin also keeps this the same everywhere. Counties and cities cannot add their own HVAC license on top, so a contractor in St. Croix County answers to the same registration as one anywhere else in the state.
For a mini-split installation, most cities and counties require a permit from the local building office. The work gets inspected once it is done. That inspection is what checks the installation here, not the state registration.
Sources: Wisconsin Legislative Reference Bureau · Wisconsin Department of Safety and Professional Services
- Is a mini split worth it?
- For a lot of homes here, yes, especially a room that never gets even heat, a garage, or an addition that was never tied into the main system. Nine months of the year this area needs heat, and a mini split with a good cold-climate heat pump can carry that load even when nights drop to 9 degrees. Where it makes less sense is trying to replace a whole-house system room by room with no plan, since each head only heats and cools the space it's in. A contractor can walk the house and say which rooms actually benefit.
- How many rooms can a mini split cover?
- One outdoor unit can run more than one indoor head, so it depends on the system you choose. Each indoor head handles its own room or open area, so the real question is how many separate spaces you need conditioned and how big they are. A single-zone system is common for one room or an addition, while a multi-zone setup can cover several rooms off one outdoor unit. Sizing that correctly means adding up the square footage and layout of each room, which is worth having a contractor do rather than guessing.
- Can a mini split heat a whole house?
- It can, but it takes enough indoor heads placed in enough rooms to cover the whole floor plan, not just one or two units. A single head warms the room it's in and maybe an open area next to it, not the rooms down a hallway or behind closed doors. This area needs heat from September through May, with winter nights averaging 9 degrees, so the outdoor unit and every head also need to be sized for that cold, not just for a mild fall day. A contractor can lay out how many zones a specific house would need to heat the whole thing.