Ducted and ductless heat pumps use the same basic technology to move heat, but they deliver it in very different ways. The right choice usually comes down to whether your home already has usable ductwork and how you want to control temperature room by room.
The core difference is how conditioned air is distributed
A ducted heat pump connects to conventional forced-air ductwork and pushes heated or cooled air through the ducts to every room. A ductless mini-split skips the ducts entirely. According to ENERGY STAR, mini-split heat pumps are specifically designed for homes or sections of homes that do not have ductwork, and instead use one or more head units mounted on an interior wall or ceiling with an accompanying unit outside. That single design decision, ducts or no ducts, drives most of the trade-offs that follow.
Ductwork itself is a source of energy loss
The ducts in a central system are not free. This Old House, citing the U.S. Department of Energy, reports that duct losses can account for more than 30% of energy consumption for air conditioning. Because a ductless system has no ducts to leak, This Old House notes that ductless AC systems use less energy than traditional central air. If your existing ducts are old, leaky, or run through a hot attic, that loss is real money every month, and it is a point in the ductless column.
Both meet the same federal efficiency floor
Efficiency ratings do not automatically favor one layout. Carrier notes that as of 2023 the Department of Energy requires a minimum of 14.3 SEER2 for residential air-source split systems, a floor that applies to ducted equipment. Carrier also states that models rated 17 SEER2 and above are considered high efficiency, with some top-tier models reaching up to 22 SEER2. Ductless systems commonly reach into that high-efficiency range as well, so compare the specific model's ratings rather than assuming one format is greener.
Cost and the homes each one fits
Ductless shines where extending ductwork is hard. ENERGY STAR points to older homes with no existing ductwork, such as those with radiators or baseboard heat, plus additions and outbuildings, as strong use cases. This Old House reports that a basic ductless installation typically runs between $4,350 and $12,250, with multi-zone setups adding roughly $1,000 or more per zone. A ducted heat pump tends to make sense when your home already has ducts in good condition and you want one hidden system conditioning the whole house. If the ducts would need to be built from scratch, the ductless route often wins on both cost and efficiency.
Frequently asked questions
Is ductless always more efficient than ducted?
Not automatically. Ductless avoids duct losses, which the Department of Energy says can exceed 30% for air conditioning, but a ducted system with sealed, well-placed ducts and a high-SEER2 unit can still perform very well. Compare the specific model ratings.
Do I need existing ductwork for a ducted heat pump?
Yes. A ducted heat pump relies on forced-air ductwork to distribute air. If your home has no ducts, building them adds significant cost, which is why ENERGY STAR frames ductless as the design for homes without ductwork.
What does a ductless system cost to install?
This Old House reports a typical range of $4,350 to $12,250 for a basic ductless installation, with each added zone in a multi-zone setup adding roughly $1,000 or more.
When is ducted the better choice?
When your home already has ductwork in good condition and you want a single hidden system conditioning the whole house, rather than wall or ceiling head units in each room.
What efficiency rating counts as high?
Carrier states that models rated 17 SEER2 and above are considered high efficiency, with some reaching up to 22 SEER2. The federal minimum for residential air-source split systems is 14.3 SEER2.