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Cooling & Heating · DuctlessDuctless Mini-Split Installation
Ductless mini-split installation for the houses central air cannot reach: radiator-heated homes with no ductwork, additions and sunrooms, third-floor bedrooms and finished attics. One outdoor unit, one or more wall heads, and a single core through the exterior wall carrying the refrigerant lines, the condensate drain and the control cable. Single-zone systems install for $4,000–$7,000.
Ductless makes the most sense where ducts would cost more than the equipment. The boiler-heated houses in Old Oakville, Kerr Village and Westdale have radiators and no ductwork, so central air means either a high-velocity system threaded through closets or a mini-split. A single-zone head in the main living space and a second in the primary bedroom covers how most of those houses are actually used, at a fraction of the disruption. Our central air vs ductless comparison shows where each one wins.
The second big use is the room the furnace cannot fix. A rear addition over a crawlspace in Bronte, a bonus room over the garage in a 1990s Millcroft two-storey, or a converted attic in an Aldershot bungalow — all of them sit at the end of a duct run that was never sized for them. A dedicated head gives that room its own thermostat and its own capacity. An addition with no practical duct route is the typical example.
Installation details are where mini-splits are won or lost. The line set has to be flared and torque-checked, pressure-tested with nitrogen and pulled into a deep vacuum before the refrigerant is released; a rushed vacuum is the most common reason we see for a mini-split that underperforms in year two. The head should sit high on an exterior wall where the condensate can drain by gravity, with the outdoor unit on a stand or bracket clear of snow drift. Every install goes on a dedicated breaker with an outdoor disconnect.
Most of the units we install are cold-climate models from Mitsubishi, Fujitsu and Daikin, so the same head heats the room in winter and can take over from electric baseboards. For pricing on your layout, see how much a ductless mini-split costs in Ontario, then request a free site visit.
Ductless is the right fit when
- The house has radiators or baseboards and no ductwork to tie into
- One room — an addition, attic, sunroom or bonus room — is hot in July and cold in January
- You want cooling in a garage workshop, home office or in-law suite with its own control
- Central air would mean opening finished ceilings to run trunk lines
- You want to retire electric baseboard heat in part of the house
How it works
We check exterior wall options, where the outdoor unit can sit, the line-set route and the panel, then quote each zone in writing.
Most single and dual-zone systems are done in one day: brackets, line set, drain, electrical, vacuum and charge, then a run test in both modes.
Ductless controls have modes people never use — dry mode, fan-only, scheduled setbacks. We walk through them before we leave.
Brands: We install Mitsubishi, Fujitsu and Daikin ductless systems and service all ductless brands, including builder-installed units.
Common questions
Is a ductless mini-split worth it compared to central air?
If you already have good ducts, central air is usually cheaper for whole-house cooling. If you have no ducts, or one problem room, ductless wins on cost and disruption and adds heating you would not get from central AC. Is a ductless mini-split worth it works through the math.
Can a mini-split heat in winter?
Cold-climate models can, down to about −25°C at reduced output. For a room on electric baseboard, the heating side is the bigger saving. Are ductless heat pumps good for heating covers the limits.
How many heads can one outdoor unit run?
Commonly up to four or five on a residential multi-zone condenser, though each extra head takes capacity from the others. Two outdoor units are sometimes cleaner than one large multi-zone.
Where does the indoor unit go?
High on an exterior wall, ideally the wall the outdoor unit sits against, so the line set is short and the condensate drains by gravity. Interior walls are possible with a condensate pump and a longer run, and we tell you the trade-off.
Do mini-splits need maintenance?
Rinse the washable filters monthly in season, and have the head's coil, blower wheel and drain cleaned every year or two — a dirty blower wheel is why older heads smell musty and lose airflow.