What a ductless heat pump is and who it suits
A ductless heat pump is an air-source heat pump that delivers heat and cooling through one or more indoor units mounted in the rooms, connected to an outdoor unit by thin refrigerant lines instead of ducts. It suits homes without ductwork, additions and spaces that need their own temperature control.
How does a ductless heat pump work?
An outdoor unit holds the compressor and a coil that collects heat from the air in winter. Copper lines run through a small hole in the wall to one or more indoor units. Each indoor unit has a coil and a fan that blows warm air into its room, then a remote or wall control sets the temperature. In summer the cycle reverses and the same equipment cools the house like an air conditioner. Our heat pump explainer covers the underlying cycle.
You will also hear the term ductless mini split. In everyday use, ductless heat pumps and mini split systems mean the same kind of equipment, and our guide to sizing and zones for a mini split picks up the planning side.
What are the advantages of a ductless system?
- No ductwork. Homes with baseboards, radiators or in-floor loops can add central-style heating and cooling without opening walls.
- Efficient delivery. Heat goes directly into the room, so a ductless system avoids the losses from leaky or uninsulated ducts.
- Zoned control. Each indoor unit has its own settings, and rooms that are rarely used can stay cooler.
- Fast installation. A typical job needs a small wall opening and a mounting pad, not a renovation.
- Heating and cooling together. One system covers both seasons, so the home needs no separate cooling system, and it saves energy on both.
What are the limits of a ductless heat pump?
Indoor units are visible on walls or ceilings, and some people dislike the look. Heat reaches closed rooms only if doors stay open or the room has its own unit, so a whole-house layout needs several heads. Filters need regular cleaning, as the maintenance checklist explains.
Winter performance also matters. Capacity and efficiency fall as outdoor temperatures drop, and not every model suits a Canadian climate. Look for a cold climate model and read its low-temperature data, as explained in reading a cold climate rating. Many homes in cold regions keep a backup heat source for the coldest days.
Which homes suit a ductless heat pump best?
Ductless systems fit older houses without ducts, small homes, additions, basement suites, garages or workshops and homes where a few rooms are cold. Larger houses can use several heads or combine ductless with a central ducted system. If you already have good ductwork, compare both options in mini split versus central ducted.
For retrofits, check the electrical panel and wall access for the outdoor unit and lines. The older-home challenges are covered in heat pump installation in older homes.
What does a ductless heat pump cost to buy and run?
Costs depend on the number of heads, capacity, efficiency rating, region and the house itself. A single-zone system generally costs less than a multi-zone system, and quotes decide. Our guides on heat pump cost and installation explain how to read the quote. Running costs follow local electricity rates and how well the house holds heat.
Rebates exist in many places and change often, so check the Government of Canada energy-efficiency pages, your province and your utility. Our guide on how to check heat pump rebates shows how.
Quick answers
Is a ductless heat pump the same as a mini split?
In practice, yes. Both terms describe a heat pump with indoor wall or ceiling units and no ducts. Mini split refers to the separate indoor and outdoor parts.
Can a ductless heat pump heat a house in winter?
Cold climate models can heat well below freezing, but output falls as it gets colder. Check the low-temperature data and plan backup heat where winters are severe.
Do ductless heat pumps need a lot of maintenance?
Mostly filter cleaning, clear space around the outdoor unit and a professional service visit now and then, as the manufacturer recommends.
Can a ductless heat pump also cool my house?
Yes. In summer it reverses and works like an air conditioner, which is why one system can cover both heating and cooling.