Mini Split Installation in Everett, WA
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Ten months of heat, almost no cooling
Winter nights around Everett average 30°F from December through February, and homes here need heat from September through June. That is 10 months a year the system is asked to work. Summer afternoons average 69°F, so cooling barely factors into the choice at all. A mini-split installed here is doing a heating job first.
More than half of homes in the area heat with electricity, so the heat pump's cold-weather performance matters more than its cooling numbers ever will. Any new unit installed now, since it is manufactured after January 1, 2023, has to meet 7.5 HSPF2 for heating and 14.3 SEER2 for cooling under the federal minimum. In a climate this heat-heavy, the HSPF2 number is the one that reflects what the system will actually be doing most of the year.
- 10 months
- September through June, your system heats
- 30°F
- the average winter night it heats against
- 69°F
- the average summer afternoon it cools against
Washington requires contractors to register with the state.
Registration means the contractor's business is on file with the Department of Labor and Industries. There is no trade exam behind it, so nothing about registration confirms someone checked the contractor's work. It tells you the business is on record, not that it can size or install a mini-split correctly.
For this job, what checks the work is the permit. Installing a mini-split in most cities and counties means the contractor pulls a permit from the local building office, and the work gets inspected once it is done. That inspection is what confirms the line set, the electrical connection and the mounting were done right.
Source: Washington State Legislature
- Is a mini split worth it?
- For most homes here, yes, because heat is needed from September through June and a mini split handles both heating and cooling with one system. Over half the homes in this area already heat with electricity, so a heat pump like this fits how the place is set up. It also means no ducts to lose heat through on the coldest nights, when winter lows average around 30°F. A contractor can look at your specific rooms and tell you what size and how many heads make sense.
- How many rooms can a mini split cover?
- A single outdoor unit can run one indoor head or several, depending on the system. Single-zone systems cover one room or open area. Multi-zone systems run several indoor heads off one outdoor unit, each one set to its own room and its own temperature. How many rooms make sense depends on the layout of the house, so a contractor will look at the space before recommending a setup.
- Can a mini split heat a whole house?
- It can, if enough indoor heads are placed to reach every room, but a single indoor unit will not heat a whole house on its own. Homes here need heat for 10 months of the year, with winter nights averaging 30°F, so the system has to be sized for that cold rather than for milder weather. A contractor can work out how many zones the house needs and where they should go to cover every room.