A ductless mini-split is a heat pump that delivers heating and cooling without a central duct system. One outdoor unit connects to one or more indoor units—often called heads—through small refrigerant lines, and each head conditions the part of the home it serves.
Most ductless systems use an inverter-driven compressor that can slow down or speed up instead of repeatedly turning fully on and off.
A single-zone system connects one indoor unit to one outdoor unit; a multi-zone system connects several indoor units to the same outdoor unit.
Ductless systems are designed to run for long periods at low output, providing quiet operation and steady temperatures in each served area.
Individual zones can usually use different temperature settings, although most residential multi-zone systems still require every connected head to remain in the same basic heating or cooling mode.
An open floor plan may be served very well by one head, while closed bedrooms and separated rooms may need their own units.
Indoor-unit style and placement affect airflow, appearance, noise, drainage, and access for future cleaning and repair.
Washable filters need regular homeowner cleaning.
Blower wheels, indoor coils, drain pans, drain lines, condensate pumps, refrigerant connections, and the outdoor unit still need periodic professional inspection and cleaning. Cold-weather heating ability also varies by model.
Ductless systems are often excellent for homes without usable ducts, additions, converted garages, bonus rooms, home offices, persistent hot or cold spots, and replacements for electric baseboard or wall heat.
Proper room-by-room sizing matters more than simply adding more heads.
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