If you’ve been researching heat pumps for your Massachusetts home, you’ve probably seen the terms ‘heat pump’ and ‘ductless mini-split’ used interchangeably — and also as if they’re different things. The honest answer: a ductless mini-split is one type of heat pump. Here’s how the categories actually break down.
All Mini-Splits Are Heat Pumps. Not All Heat Pumps Are Mini-Splits.
A heat pump is the underlying technology — a system that moves heat from outside to inside (heating mode) or inside to outside (cooling mode) using a refrigerant cycle. There are several different ways to package that technology. The main categories are: Air-source heat pumps with full ductwork (look like a central AC unit but provide heating too), ductless mini-splits (use individual wall- or ceiling-mounted indoor units instead of ducts), air-to-water heat pumps (provide heated water for radiators or radiant flooring), and geothermal heat pumps (use ground temperature instead of outdoor air).
When People Say ‘Heat Pump’ They Usually Mean…
…one of two things. In Massachusetts in 2026, when someone says ‘heat pump’ they usually mean either an air-source heat pump with central ductwork (replacing an old furnace or AC) or a ductless mini-split system (added to a house that doesn’t have ductwork or doesn’t have it everywhere). Both are heat pumps. The differences are how the heat gets distributed inside the house.
Ducted Air-Source Heat Pump
Best for: Houses that already have ductwork (typically post-1970 single-family homes that previously had a furnace or central AC). How it works: An outdoor unit (looks like a central AC condenser) and an indoor air handler with a fan and refrigerant coil. The air handler sits where your furnace used to be and uses the existing duct system to push heated or cooled air through the house. Cost installed: $9,000-$16,000 in our area depending on size, complexity, and electrical service upgrades. Mass Save rebate: Up to $10,000 for full whole-home conversions. Pros: Centrally controlled, even temperature throughout the house, works with existing duct system, easier integration with whole-house humidification or filtration. Cons: Only works if you already have ducts (or you’re willing to install ducts — expensive), single-zone temperature control unless you add zoning.
Ductless Mini-Split System
Best for: Houses without ductwork (typically older homes with hydronic baseboard or radiator heat), houses where you want zone-by-zone temperature control, finished attics, additions, or houses where you don’t want to give up closet/wall space to ducts. How it works: An outdoor unit (smaller than a central AC condenser) connected via small refrigerant lines to one or more indoor heads — wall-mounted, ceiling-cassette, or floor-console units. Each head can be controlled independently. A single outdoor unit can support 2-8 indoor heads. Cost installed: $5,500-$8,000 for single-zone (one outdoor + one indoor); $12,000-$20,000+ for multi-zone whole-home systems. Mass Save rebate: Same up to $10,000 if it’s a whole-home conversion. Pros: No ductwork required, individual zone control, very efficient at part-load, allows precise comfort tuning room by room. Cons: Visible indoor units (some find them ugly), each head needs power, multi-head systems are complex installs.
Hybrid Configurations
Some houses get a mixed system. A common configuration in our area: existing hot-water boiler kept as backup, plus mini-splits installed for primary heating and cooling. The mini-splits handle 90%+ of the load efficiently; the boiler kicks in only on the coldest days when heat pump efficiency drops. This is sometimes called a ‘dual-fuel’ or ‘hybrid’ system. It costs more upfront than either single approach, but operates very efficiently and reliably in extreme cold.
Which One Should You Choose?
If you have ductwork, replace your furnace or AC with a ducted heat pump. The integration is clean, you keep central control, and the cost is reasonable. If you don’t have ductwork (boiler-heated house), a ductless mini-split system is almost always the right choice — installing ductwork in a house that wasn’t designed for it costs $20,000-$40,000+. If you have a partial-ductwork situation (most of the house ducted, a finished attic or addition not), a hybrid configuration with a ducted heat pump for the main living areas and ductless mini-splits for the unconditioned spaces is common. We model all the options on the in-home estimate.
Want help thinking through which configuration fits your house? Sedona Plumbing and Heating is a Mass Save registered Heat Pump installer covering all 23 of our service-area towns. Call (781) 242-2386 to book an appointment.
