Ducted vs. ductless: same job, two different sets of tradeoffs.

What's actually different

A ducted system is a single outdoor compressor paired with an indoor air handler that pushes heated or cooled air through a network of supply and return ducts to registers throughout the house — functionally a drop-in replacement for a central furnace-and-AC setup, and the natural choice when that ductwork already exists and is in good shape.

A ductless (mini-split) system runs refrigerant line sets directly from the outdoor compressor to one or more indoor heads, each conditioning the room it's mounted in. Multi-zone ductless systems can run several indoor heads — often 2 to 8 — off a single outdoor unit, each with independent temperature control, which is the main reason ductless has become the default retrofit choice for additions, older homes without ducts, and homes being converted zone by zone.

Where the heat actually goes

The single biggest efficiency gap between the two isn't the equipment — it's the ductwork. Conditioned air traveling through an attic, crawlspace, or unconditioned basement loses a meaningful share of its heat before it ever reaches a room. Multiple sources converge on a duct loss range of roughly 20%–30% for a typical central ducted system with average duct condition and location (Mass Save; Daikin Quebec). A ductless system, by design, has no ducts to lose heat through — the indoor head sits in the room it's heating.

That gap shows up in efficiency ratings, too: ductless systems reach SEER2 ratings as high as the high-30s, while ducted systems typically top out in the 15–24 range (Bay Area Climate Control). Both numbers describe the equipment under lab conditions — the duct-loss gap above is what happens to that efficiency once it has to travel through your house.

What each one actually costs

Ducted systems generally cost less to install when usable ductwork is already in place: EnergySage puts the average ducted heat pump install around $14,529, against $25,957 for a whole-home ductless retrofit covering multiple zones (EnergySage). Per-zone, ductless pricing is far more variable — typical single-zone installs run roughly $1,500–$4,500, while advanced multi-zone setups covering a whole house can run $7,000–$12,000 or more depending on the number of heads (Angi; CurrentCost; ContractorRanks).

Looking at it over a 10-year ownership window changes the picture somewhat: one comparison estimated whole-home ductless at $15,000–$25,000 upfront but with 15%–25% lower energy use, against $12,000–$18,000 for central ducted with its 10%–30% duct-loss penalty baked in for the life of the system (NuWatt Energy). Whichever wins depends heavily on local electricity rates and how many zones the home actually needs — run the numbers for your own situation with the Heat Pump vs. Traditional HVAC tool.

Which one actually fits your home

• Existing ductwork in good shape, whole-house even heating already working: ducted is usually the lower-cost, lower-hassle choice — you're keeping infrastructure that already does its job.
• No ductwork, an addition, a converted garage, or a home with uneven room-by-room comfort: ductless avoids the cost and disruption of adding ducts, and lets you condition just the rooms that need it.
• Old, leaky, or undersized ducts in an attic or crawlspace: sealing and insulating that ductwork (or replacing it) needs to be part of any ducted cost comparison — otherwise the "cheaper" ducted quote is hiding an ongoing 20%–30% efficiency tax.
• A home that needs independent zone-by-zone control (different schedules for a home office, a bonus room, a bedroom wing): multi-zone ductless is purpose-built for this in a way a single-zone ducted system isn't.
• Whichever system you choose, it still needs to be sized correctly. Ducted and ductless are both susceptible to the same oversizing mistakes — see the Sizing a Heat Pump Correctly guide before you sign a contract for either.