Overview
There are two common ways to cool, and usually heat, a house. A ductless mini-split is an outdoor condenser wired to one or more indoor heads mounted on a wall or ceiling. No ductwork. Each head runs as its own zone, and almost every mini-split is a heat pump, so the same equipment heats in winter and cools in summer. Central air is one system that pushes conditioned air through a network of ducts to registers in every room, run off a single thermostat. Ducted central air pairs with a furnace or its own heat pump for heating.
The choice comes down to a short list: do you already have ductwork or not, do you want room-by-room zoning or one whole-house setting, how much efficiency you want to squeeze out, what you are willing to spend, and how much you care about seeing equipment on the wall. I will walk each system on its own, put them head to head, and tell you which one I would pick for a given house. The ductwork question carries more weight than the rest combined, so start there.
Ductless Mini-Splits
The headline feature is right there in the name: no ductwork. That is a big deal for additions, older homes that never had ducts, garages, finished attics, sunrooms, and any space where running ducts would mean tearing into walls. You mount a head, run a small line-set through a three-inch hole, and you are conditioning that space.
Mini-splits are zoned by design. Each indoor head has its own setting, so you cool the bedroom you sleep in and leave the spare room alone. They are also very efficient. There are no ducts to leak conditioned air into an attic, and the inverter compressors ramp up and down instead of slamming on and off. Because they run as heat pumps, they heat too, and cold-climate models hold output well below freezing.
The downsides are real. The indoor heads are visible on the wall, which some people dislike. The per-ton cost runs higher than central air, and once you are hanging four or five heads to cover a whole house, the total climbs fast. Each head needs a condensate path and a line-set routed back to the condenser, so a sloppy install shows up as drips and stains. Mini-splits are the pick when there are no ducts and you want zoning.
Central Air (Ducted)
Central air conditions the whole house through one system and a network of ducts. The equipment is hidden; what you see is supply registers, a return grille or two, and a thermostat on the wall. For a house that already has good ductwork, this is the familiar default, and it delivers even comfort across every room off a single setting.
At whole-house scale, central air wins on cost per ton. One condenser and one air handler cover the entire floor plan more cheaply than a head in every room. The equipment is also out of sight in a closet, attic, or basement, which is why most buyers expect it.
The catch is the ductwork. If the house does not have ducts, adding them is expensive and invasive, often the single biggest line item in the job. Ducts also leak. A run through an unconditioned, uninsulated attic bleeds off a chunk of what you paid to cool, and a leaky, poorly sealed duct system wastes a surprising amount of capacity. Central air is one zone unless you add zoning dampers and controls. The air handler and the duct chases take up real space. Central air is the whole-house default when the ducts are already there.
Head to Head
Ductwork: mini-split needs none; central needs a full duct system, which is the make-or-break factor. Efficiency: mini-split wins, because there are no duct losses and the inverter compressor modulates instead of cycling; central gives back efficiency through duct leakage, especially in an attic.
Zoning: mini-split is zoned out of the box, one head per zone; central runs as a single zone unless you pay for dampers and a zoning panel. Install: mini-split is far easier in a no-duct or retrofit situation; central is easier and faster when the ducts already exist and just need a new condenser and air handler.
Cost: central is cheaper per ton at whole-house scale if the ducts are in place; mini-split is cheaper for a single room or an addition where you avoid the cost of running ducts entirely. Looks: central hides everything behind registers; mini-split puts a head on the wall in each conditioned room.
Heating: both can be heat pumps. Mini-split cold-climate units heat down into real cold, and central can run a heat pump or pair the air handler with a gas furnace. Neither is a clear loser. The answer depends on the house in front of you, and the duct question settles most of it.
Which to Choose
Go central air if the house already has ducts, or you are building new and putting ducts in anyway, and you want whole-house comfort, hidden equipment, and the lowest cost per ton. For a typical ranch or two-story with existing ducts in decent shape, central is the straightforward call.
Go mini-split for additions, garages, and older homes that never had ducts, or when you want room-by-room zoning, maximum efficiency, or spot cooling and heating in one or two problem rooms. The no-ducts question usually decides it on its own: if running ducts means gutting plaster and boxing in soffits, a mini-split saves you that demolition.
A hybrid is common and often the smart move. Keep the central system that already serves the main house and hang a single mini-split head on the bonus room over the garage or the new addition that the ducts never reached. There is also a middle option: a ducted mini-split, which uses a high-efficiency inverter heat pump feeding a short, compact duct run for one floor or zone. That gets you the efficiency and quiet of a mini-split with hidden, register-fed delivery.
FAQ
Can a mini-split heat my house in winter? Yes. Almost all mini-splits are heat pumps, so they heat and cool with the same equipment. Standard units lose output in deep cold, but cold-climate models are rated to hold heat well below freezing and handle real winters in most of the country.
Is a mini-split more efficient than central air? Generally yes. It has no ducts to leak conditioned air, and the inverter compressor ramps up and down instead of cycling hard on and off. A central system can match it on paper, but duct leakage in an attic usually erases part of that rated efficiency in the real world.
Do I have to put an indoor head in every room? No, but each head covers its own zone, so open layouts and a few key rooms work well while a chopped-up floor plan needs more heads. If you want hidden, whole-room delivery without a head on every wall, look at a ducted mini-split with a short duct run.
Which one is cheaper? Depends on the house. If the ducts already exist, central air is cheaper per ton for the whole house. For one room, an addition, or any space with no ducts, a mini-split is cheaper because you skip the cost and demolition of running ductwork.