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Mini-Splits for Older Homes and Additions

Older homes, additions and garages often have no ducts or ducts that can't reach them. A ductless mini-split adds heating and cooling without tearing open walls.

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How they install

An outdoor unit connects to indoor heads through a small hole in the wall. No ducts are needed.

Diagram: a ductless mini-split has an outdoor unit linked to an indoor head by a small line set through the wall.
Diagram: a ductless mini-split has an outdoor unit linked to an indoor head by a small line set through the wall.

Good fits

Heritage homes, additions over garages, basement suites, sunrooms, shops and detached garages.

Heating and cooling

Mini-splits are heat pumps, so they cool in summer and heat in winter. Cold-climate models keep working in low temperatures.

Zoning

Each indoor head has its own controls, so different rooms can be kept at different temperatures.

Upkeep

Clean the indoor filters regularly and keep the outdoor unit clear of snow and debris.

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See ductless mini-splits.

Planning tips

Count the rooms you want to heat or cool and note their sizes and window directions before you ask for quotes. A sunny west-facing room needs more cooling; a room over a garage needs more heating. Those details help the technician size the system so it isn't too small or wastefully large.

Electrical needs

A mini-split's outdoor unit needs its own circuit. In an older home, the electrical panel may need checking for space and capacity. The technician can tell you whether an electrician is needed as part of the job.

Quiet operation

Mini-splits are quiet indoors and out, which suits bedrooms and home offices. Ask where the outdoor unit can go so it isn't right under a window.

Heritage details

In older homes the line set can often be routed through a closet or along the outside wall, keeping trim and plaster intact.

More heating and cooling guides

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