Mini Split Installation in Farmington, ME
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Farmington needs a mini-split built for cold, not for cooling
Your mini-split will run September through June here, ten months of the year, and almost none of that time is for cooling. Summer afternoons average 73°F, mild enough that the compressor barely has to work. What it has to handle is the other ten months, when winter nights average 8°F and the heat pump does the job a furnace or boiler would otherwise do.
At 8°F, a mini-split needs to be sized and installed for real cold, not just mild shoulder-season days. Over half of homes here still heat with fuel oil, so a new mini-split is often taking on more of the heating load than a typical replacement would. Any unit installed now, if built after January 1, 2023, has to meet 7.5 HSPF2 for heating and 14.3 SEER2 for cooling under the federal minimum, but in a place this cold, how well it holds up below freezing matters more than the rating on the label.
- 10 months
- September through June, your system heats
- 8°F
- the average winter night it heats against
- 73°F
- the average summer afternoon it cools against
- Is a mini split worth it?
- In this area, yes, and mostly because of what it replaces. Over half the homes here heat with fuel oil, and a cold climate mini split can carry the heating load on its own even on winter nights that average 8°F. It also gives you something oil heat doesn't. It needs far less power than a furnace blower and oil burner, so it can keep running during the storm outages this area sees. A contractor can size one to your house and tell you what it would replace.
- How many rooms can a mini split cover?
- A single outdoor unit can run one indoor head or several, depending on the model. Each indoor head heats and cools the room it's mounted in, so an open floor plan might only need one, while a house with several closed off bedrooms needs a head in each. The outdoor unit has to be sized for the total load of every room it's feeding, which is why a contractor measures each room before recommending a system.
- Can a mini split heat a whole house?
- Yes, if it's sized and placed for that. A cold climate mini split with enough indoor heads, one per room or zone, can carry the full heating load of a house even where winter nights average 8°F. What makes or breaks it is whether every room has a head or is open to one that does. A closed door on a room with no head means that room stays cold. A contractor can walk the house and tell you how many zones it would take.