A ductless mini-split is the better choice for spaces that don’t have ducts or can’t easily get them — additions, garages, bonus rooms over garages, sunrooms, finished attics and basements, and older homes with no ductwork — and for zoning a problem room; central air (a ducted heat pump or AC) is usually the better choice for a whole house that already has usable ducts, where a single system is cheaper, simpler and less visually intrusive than four or five wall heads. Both are heat pumps in most modern forms and both qualify for the same kinds of rebates.
Where mini-splits win
No ducts, or ducts that would cost more to add than the heads (ductwork cost); one or two spaces that the central system can’t keep comfortable; zoning (each head is its own thermostat); efficiency for the spaces served (inverter compressors, no duct losses); quiet operation; and staged installation over time. Typical costs: mini-split cost.
Where central air wins
Whole-house replacement with existing ducts (usually cheaper than a 4–5 head mini-split system); one filter and one thermostat instead of several; no wall units in living spaces; better whole-house air distribution and, with a variable-speed system, whole-house humidity control; and simpler service. Typical costs: heat pump cost.
Comfort and humidity in NC
Central variable-speed systems with well-sealed ducts handle whole-house humidity best. Single-zone mini-splits do fine in the room they serve; multi-zone systems can under-dehumidify when only one head is calling, so in humid climates ask about dry mode and consider a dedicated dehumidifier for problem areas. Humidity control.
Aesthetics and maintenance
Wall heads are visible; ceiling cassettes and concealed-duct heads cost more but hide better. Mini-split filters need cleaning monthly in use; heads and outdoor units need periodic coil cleaning. Central systems have one filter and one air handler.
A common best-of-both
Keep or replace the ducted system for the main house; add a single-zone mini-split for the room that never cooperates (bonus room, garage office, sunroom). It solves the problem room without oversizing the central system. Every contractor on the North Carolina registry shows the license status we found.