Same system, two ways to deliver the air
A mini split is a heat pump: an outdoor condenser connected by a thin line set to an indoor unit. What changes is that indoor unit. Ductless means a visible head - the familiar box on the wall, or a cassette in the ceiling or a console on the floor - that blows conditioned air straight into the room it's mounted in. Ducted means a compact, concealed air handler tucked into a ceiling, attic, soffit, or closet that pushes air through short duct runs to a few rooms, so all you see is a discreet supply grille in each one. Same compressor, same refrigerant, same efficiency technology. You're choosing where the air comes from and whether you see the box. For the full lineup of indoor shapes, see our mini split types guide; for the underlying heat-pump operation, how mini splits work.
Looks: the reason ducted exists
This is the honest headline. Most people who pay more for ducted do it for one reason - they don't want a unit on the wall. A ductless head is visible in every room it serves. A ducted handler is invisible; the room reads like central air, just cleaner ceiling grilles and nothing on the wall. If a wall head would bother you in a living room or primary bedroom - or an HOA, a landlord, or a period renovation rules it out - ducted (or the concealed short-duct form factor) is the answer. If you don't mind the head, you're about to save real money. Our how to hide a mini split guide covers the middle-ground tricks too, for people who want ductless economics with a lower profile.
Efficiency: ductless has the edge
Ductless is typically the more efficient of the two because the air goes straight from the head into the room - there's nothing to lose along the way. A ducted handler runs air through duct, and duct always costs you a little to friction and to any heat gain or loss along the run, especially through an unconditioned attic. The gap is modest when the ducts are short, sealed, and inside conditioned space, and it grows when they're long or poorly insulated. If squeezing out maximum seasonal efficiency is the goal, ductless is the safer bet - see most efficient mini splits for how the top performers stack up.
Cost: ductless is usually cheaper to install
Ductless costs less to put in because there's nothing to fabricate - the installer hangs a head, runs the line set, and you're done. Ducted adds the air handler, the duct runs, the grilles, and the labor and space to build all of it, so it lands higher. It also demands room for the equipment: a ceiling cavity, a soffit, a closet, or attic space the ducts can run through. That's a big reason ducted fits new construction and remodels better than finished, tight retrofits. Price your actual layout before deciding - our mini split installation cost guide breaks down where the money goes for each approach.
Coverage and zoning: one head, one room
Air doesn't travel through doorways well, so a single ductless head really conditions the room it's in - hallways, closed doors, and corners get little. Several rooms therefore need several heads, or a multi-zone system. A single ducted handler can serve several small, adjacent rooms from one unit, which is why it's such a natural fit for a cluster of bedrooms off a shared hallway. The tradeoff is control: ductless gives you true per-room setpoints, while a ducted handler groups its rooms onto one zone that heats or cools together. If independent room control matters, that's a point for ductless. Deciding how many independent zones you need is its own question - work through single vs multi-zone before you commit.
Comfort, noise, and the hybrid option
Two smaller practical differences round this out. Noise: a ductless head puts the fan in the room, while a ducted handler moves that fan noise out to the ceiling or closet, so the living space stays quieter. And you don't have to pick a side for the whole house - many multi-zone systems mix ductless heads and a ducted handler on a single outdoor condenser. That's often the smartest layout: a concealed ducted handler over the bedroom wing where you want it hidden and grouped, plus wall heads in the living room and a bonus space where per-room control and lower cost win.
When each one wins
Choose ductless when budget matters, when you want maximum efficiency, when you're conditioning one or two rooms, or when the install has to stay simple. Choose ducted when hiding the equipment is worth the premium, when you have several small or adjacent rooms to group onto one handler, or when you're building or remodeling and have the space for an air handler and short duct runs. Most homes land on ductless; a meaningful minority - and most people chasing an invisible install - are better served by ducted or a hybrid.
Bottom line
Ductless mini splits are the default: cheaper, a touch more efficient, easier to install, and better for per-room control. Go ducted when you want the equipment out of sight, need to serve several small rooms from one unit, or have the space in new construction or a remodel to do it right - and remember you can combine both on one system. Size the rooms first, decide how many zones you truly need, then let looks and layout break the tie.