It depends on one thing: whether your home already has ductwork. If you have existing ducts in good condition, central air wins on cost and resale. If you don't, ductless mini-splits win decisively — and it isn't close.

Here's the fast version. Adding central air to a home without ducts means paying $10,000–$16,000 just for the ductwork before you touch the actual system, pushing the total to $18,000–$25,000. A ductless mini-split covering the same square footage runs $8,000–$16,000 installed with no demolition, no soffits, and no lost closet space. That gap is the whole decision.

The Math

For a home with usable existing ducts: central air installs for $6,000–$12,000 for a 3-ton system. A comparable multi-zone mini-split (3–4 heads) lands at $10,000–$18,000. Central air is cheaper here, full stop, because you're only replacing equipment.

For a home without ducts: central air jumps to $18,000–$25,000 once ductwork is added. Mini-splits stay at $8,000–$16,000. You save $6,000–$10,000 up front and skip weeks of drywall repair.

On operating cost, mini-splits win either way. Their inverter compressors and zoned control cut cooling bills 20–30% versus a single-stage central unit, because you're not conditioning empty rooms. Over a 15-year lifespan that's roughly $2,000–$4,000 in savings.

On payback: a mini-split retrofit in a ductless home effectively pays for itself immediately against the central-air alternative — you never spend the ductwork money. In a ducted home, choosing mini-splits over central air costs you $4,000–$6,000 more up front, recovered slowly through efficiency over 8–12 years. That's a long wait.

The single biggest cost in any central air retrofit is the ductwork nobody sees. If it's already there, keep using it.— HVAC estimator, residential retrofits

Resale: Where Central Air Pulls Ahead

This is the catch that flips the verdict. On resale, central air recovers about 35–50% of its cost and, more importantly, buyers and appraisers treat it as the expected standard. A full-home central system reads as 'move-in ready.'

Mini-splits recover a similar 30–45% but carry a perception penalty in some markets — visible wall units and multiple outdoor condensers can read as a workaround to buyers who don't understand them. For whole-home coverage in a mid-to-high-end market, central air protects value better.

When Ducts Win — and When They Don't

Central air wins if: you have sound existing ductwork, you're covering the entire home, or you're in a market where central air is the assumed baseline. In those cases the verdict flips and mini-splits become the more expensive, harder-to-sell choice.

Mini-splits win if: you have no ducts, you're cooling an addition, garage, sunroom, or attic conversion, you want room-by-room zoning, or your home has boiler/radiator heat and no air handling at all. For targeted problems, mini-splits are unbeatable — a single-zone unit for one hot room costs $3,000–$5,000 versus rebuilding an entire duct system.

The tipping point is coverage plus ducts. Whole-home with ducts: go central. Anything else: go ductless.

Before You Commit

The right answer hinges on an accurate load calculation and an honest inspection of your existing ductwork — two things a good contractor delivers and a bad one skips. Get quotes for both options so you can see the ductwork line item for yourself, then decide with the real numbers in front of you.