Comparison
Mini split vs central air
Both use the same refrigeration cycle. What differs is how cool air gets to each room.
Written by HYRE HVAC Research Desk Primary-source research, data analysis and fact checking
The short answer
Mini split vs central air is mostly a question about ducts. Central air pushes conditioned air from one indoor coil through a duct system to every room.
A mini split puts a small indoor head in each zone and runs refrigerant lines to it, with no ducts. If you have sound ducts, central air is usually the simpler fit.
If you have none, or need to cool a few rooms, a mini split usually is.
How do they deliver air differently?
A central system has one outdoor unit, one indoor coil at the furnace or air handler, and a network of supply and return ducts. Every room gets air from the same coil, controlled by one thermostat unless the system is zoned.
A ductless mini split has an outdoor unit and one or more indoor heads, each with its own fan and controls. Refrigerant travels to each head through a small line set. Each head is its own zone. Many mini splits are heat pumps, so they heat as well as cool.
DOE’s 2018 review of field studies found duct leakage and low airflow among the most common faults in installed systems. A mini split avoids duct losses altogether. A central system can be just as good if its ducts are sealed and sized properly, but in many houses they are not.
Mini split vs central air at a glance
| Mini split (ductless) | Central air (ducted) | |
|---|---|---|
| Ducts needed | No | Yes, supply and return |
| Zoning | Each head is a zone | One zone unless dampers are added |
| Indoor equipment | Wall, ceiling or floor heads in each zone | One coil and blower, hidden vents |
| Filtration | Small washable screens in each head | One central filter that can take higher MERV ratings |
| Best fit | Additions, older homes without ducts, single rooms | Homes with sound ducts that need whole-house air |
| Duct losses | None | Depends on the duct system’s condition |
Certified efficiency for either system comes from the AHRI Directory for the exact model pairing.
What drives the cost of each?
For central air, the main variables are whether the ducts can be reused, whether the indoor coil and furnace match the new outdoor unit, and the labor of the swap. Adding ducts to a house that has none is the expensive case.
For a mini split, the main variable is the number of indoor heads. Each head adds equipment, a line set, a condensate route and labor.
One or two heads is a modest job; a head in every room adds up fast and may end up costlier than a ducted system. We publish no prices here: we do not yet hold enough sourced, dated quotes to state one honestly.
Use the cost hub and the HVAC cost calculator with your own quotes.
Where each one wins
A mini split wins when
The house has no ducts, or ducts would be hard to add.
You need to cool or heat one area: a converted garage, an addition, a bonus room over the garage.
Different rooms want very different temperatures.
Central air wins when
Sound ducts already reach every room.
You want one central filter and no visible indoor heads.
You need air in many small rooms, where one head per room would be clumsy.
What about upkeep?
Each mini split head has a washable filter screen and a coil that collects dust; the screens need rinsing often, and the heads and their drain lines need periodic professional cleaning to keep mold and odors away.
A central system has one filter to change and one coil and drain to check, but its ducts can leak or collect dust over the years. Neither is maintenance-free. Plan for the upkeep of the system you choose.
Questions to ask before choosing
A duct leakage test tells you whether reusing them is a good idea.
Ask for a load figure per zone. An oversized head short-cycles and handles humidity badly.
Each mini split head makes water. Ask how it drains and whether a pump is needed.
Multi-head systems are rated as specific combinations. Ask for the matched rating.
Questions
Is a mini split cheaper to run than central air?
Can a mini split cool a whole house?
Do mini splits heat?
Can I add a mini split to a house with central air?
Who can install a mini split?
Written and audited by
HYRE HVAC Research Desk
Primary-source research, data analysis and fact checking
We are a research desk, not a sales floor. We read the federal microdata file, the statute or the manufacturer data sheet ourselves, and we publish the figure with the document it came from and the date we retrieved it.
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