Mini Split Installation in Portland, ME
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 Cumberland County will get in touch.
Tell us about the job
It takes about a minute.
Cumberland County asks a mini-split to run almost all year
Winter nights here average 15°F from December through February, and most homes need heat from September through May. That is 9 months of heating, plus July and August, when a mini-split earns its keep on 78°F afternoons. Only one month goes by without either running.
A new unit has to hold up through nights well below freezing, not just take the edge off a mild fall evening. Any mini-split installed now falls under the same federal minimum as other split-system heat pumps. It has to reach 14.3 SEER2 for cooling and 7.5 HSPF2 for heating. Almost half the homes here still heat with fuel oil, so a properly sized mini-split is often the first real alternative to it, not just a backup.
- 9 months
- September through May, your system heats
- 2 months
- July through August, it cools
- 15°F
- the average winter night it heats against
- 78°F
- the average summer afternoon it cools against
NOAA nClimDiv, 1991–2020 normals
- Is a mini split worth it?
- For most homes here, yes, especially if you're heating with fuel oil now. A mini split is a heat pump, so it can both heat and cool, and it does it without ductwork. With winter lows averaging 15°F, look for a cold-climate model, since standard heat pumps lose capacity as the temperature drops. A contractor can tell you whether it should replace your current heat source or work alongside it.
- How many rooms can a mini split cover?
- A single outdoor unit can run one indoor head or several, depending on the system. Each indoor head heats and cools the room it's mounted in, so an open floor plan does better than a house with a lot of closed doors and hallways. A contractor sizes the system to the rooms you want covered and how they connect to each other.
- Can a mini split heat a whole house?
- It can, if it's sized and placed for that. A multi-zone system with a head in each main room can carry the whole house, and a cold-climate model is built to keep working through winter nights down to 15°F. Homes here need heat from September through May, so that cold-weather performance matters more than it would somewhere milder. A contractor can work out how many zones your house needs and where they should go.