# Should I get a mini split or a ducted heat pump?

> Ductless mini split, ducted mini split or a central ducted heat pump? How the three compare in a DC house, and how your ducts, radiators and rooms decide it.

URL: https://roomwisedcminisplits.com/guide/mini-split-vs-ducted-heat-pump/

Decision Guide

All three are heat pumps. The choice is about how the heat reaches your rooms, and what your house already has to carry it.

Last Updated: November 11, 2026

The short answer

If your house has sound ducts that reach every room, a central ducted heat pump on those ducts is the simpler swap. If it has radiators and no ducts, a ductless mini split is the cleaner path, with a ducted mini split where an attic, closet or basement can hide one. Many DC houses mix them.

Key takeaways

- Ductless mini splits, ducted mini splits and central heat pumps all move heat the same way.
- Existing ducts favor a central heat pump; radiators and plaster favor ductless heads.
- A ducted mini split is the middle path: hidden equipment, short ducts, a few rooms.
- Old ducts need checking for size, leaks and reach before any heat pump uses them.

“Heat pump” covers more than one kind of system, which makes this comparison confusing. [Roomwise DC Mini Splits](https://roomwisedcminisplits.com/) plans ductless and ducted mini splits, and this guide sorts out the three systems people mean so you can match one to your house.

## Three systems, one way of moving heat

A heat pump moves heat with refrigerant: out of the house in summer, into it in winter. Ductless mini splits, ducted mini splits and central heat pumps all do this. They differ in how air gets to the rooms.

|  | Ductless mini split | Ducted mini split | Central ducted heat pump |
| --- | --- | --- | --- |
| Indoor equipment | A head in each room or zone | A small air handler hidden in a closet, attic or ceiling | A full-size air handler, often in a basement or closet |
| Ducts | None | Short runs to a few nearby rooms | A full duct system to every room |
| What you see | The head | A grille in each room | Registers and a return |
| Room control | Each head on its own | Each air handler is one zone | One zone unless dampers are added |
| Best fit | Radiator houses, single rooms | Top floors with an attic, basements, small bedrooms | Houses with good ducts already |

## If your house already has ducts

A house with a furnace and ducts is set up for a central heat pump. Furnaces are the most common main heat in DC, so many houses start here.

Before reusing the ducts, check three things:

- **Size.** Heat pumps move more air at a milder temperature than many furnaces, and small ducts can be noisy or short of air.
- **Leaks and location.** Ducts in an unconditioned attic or crawlspace lose heat and cooling before it reaches the rooms.
- **Reach.** Basement-fed ducts often run weak by the top floor.

If the ducts pass, a central heat pump on them is usually the simplest whole-house answer. If they miss a floor, a mini split can cover that floor; see the [central air guide](https://roomwisedcminisplits.com/guide/mini-split-vs-central-air/) for that pairing.

## If your house heats with radiators

A radiator house has nothing to connect a central heat pump to. Building ducts through plaster, brick and finished ceilings is the costly part, not the heat pump itself.

About one DC home in five heats with a steam or hot-water boiler. In those houses, ductless heads are the practical default. The [old houses guide](https://roomwisedcminisplits.com/guide/air-conditioning-old-houses-without-ductwork/) covers the whole range of options, so this guide doesn’t repeat them.

## The middle path: a ducted mini split

A ducted mini split uses a slim air handler and short ducts to serve a few rooms from a hidden spot. It gives you grilles instead of heads, without a full duct system.

### Where it fits in a DC house

- **Under a pitched roof or in a knee wall,** serving two or three top-floor bedrooms
- **In a basement ceiling,** serving the basement or the rooms just above
- **In a hall closet,** feeding small bedrooms too small for their own heads

The trade-offs: the closet or attic gives up space, the filter needs an access panel, and all rooms on the unit share one setting. The [ducted mini split installation page](https://roomwisedcminisplits.com/ducted-mini-split-installation/) explains the work, and the [indoor unit types guide](https://roomwisedcminisplits.com/guide/mini-split-indoor-unit-types/) compares it with wall, floor and ceiling heads.

## Winter heat with each system

All three are sized to the same DC heating design temperature, 21°F. What differs is the backup when the outdoor air drops below that.

### Backup options

- **Central heat pump:** electric strips in the air handler, or the old furnace kept as a dual-fuel backup
- **Mini splits in a radiator house:** the boiler kept on standby for the coldest nights
- **All-electric mini split plan:** heads sized to carry the design day, with the winter output checked against each room’s load

The [winter performance guide](https://roomwisedcminisplits.com/guide/do-mini-splits-work-in-winter/) explains how output falls as it gets colder.

## Rebates and running cost

DCSEU’s current program lists rebates for ductless mini-split heat pumps at two efficiency tiers, with larger amounts when the system replaces gas heat. Check DCSEU’s current form for its terms on ducted equipment.

The amounts, rules and paperwork are covered in the [DC rebates guide](https://roomwisedcminisplits.com/guide/mini-split-rebates-dc/). On running cost, the leaks in old ducts can matter more than the equipment’s rating; well-sealed ducts or no ducts at all keep more of the heat you pay for.

## What it costs

Roomwise’s typical range for a standard single-zone install is $3,000 to $6,000, and for a standard multi-zone install with two to four heads, $5,000 to $14,000. A ducted mini split falls in these ranges or above, depending on the duct work and access.

For a central heat pump on existing ducts, the price turns on the duct condition, the air handler’s spot and the panel. The [DC cost guide](https://roomwisedcminisplits.com/guide/mini-split-installation-cost-washington-dc/) lists our complex ranges too.

## How to decide

Start with what the house already has:

1. **Sound ducts to every room:** a central heat pump is the natural fit.
2. **Ducts that miss a floor:** keep them for the rest, add a mini split for that floor.
3. **Radiators, no ducts:** ductless heads, with a ducted mini split wherever an attic, closet or basement can hide one.
4. **Small bedrooms in a row:** a ducted mini split often serves them better than a head in each.

The [assessment tool](https://roomwisedcminisplits.com/tools/mini-split-assessment/) asks about your heat and rooms and suggests where to start.

## Questions about this guide

### Is a ductless heat pump the same thing as a mini split?

In practice, yes. A ductless heat pump is a mini split, an outdoor unit joined by refrigerant lines to indoor heads. "Mini split" is the everyday name; "ductless heat pump" is the name rebate programs and spec sheets tend to use.

### Can I add mini splits upstairs and keep my ducted system downstairs?

Yes. A mini split on the top floor can take over the rooms the ducts never served well, while the ducted system keeps the lower floors. Each system runs on its own controls, and the heads upstairs stop the ducted system from running hard to reach them.

### Are my old ducts good enough for a heat pump?

They need checking first. A heat pump moves more air at milder temperatures than many older furnaces, so undersized or leaky ducts can leave rooms short. Ducts running through an unheated attic or crawlspace also lose heat. The duct size, sealing and reach decide whether they can stay.

## More guides

- [Decision Guide**Is a mini split better than central air?** The answer turns on your ducts. What each system does well, where each falls short in a DC house, and how the two can work together.](https://roomwisedcminisplits.com/guide/mini-split-vs-central-air/)
- [Learn**What types of mini split indoor units are there?** The four kinds of indoor unit, what each asks of the room and the structure around it, and how to pick one for a plaster wall, a radiator bay or a basement ceiling.](https://roomwisedcminisplits.com/guide/mini-split-indoor-unit-types/)
- [Learn**Do mini splits work in winter?** What happens inside a heat pump on a 25-degree DC morning, how to read a unit's cold-weather numbers, and how to plan for the handful of nights that test it.](https://roomwisedcminisplits.com/guide/do-mini-splits-work-in-winter/)
- [Cost Guide**What rebates can I get for a mini split in Washington, DC?** The DCSEU heat pump rebate explained in plain terms, from the efficiency tier and the heat you're replacing to the permit, the paperwork and the date it has to be in.](https://roomwisedcminisplits.com/guide/mini-split-rebates-dc/)
- [Learn**How do you air condition an old house without ductwork?** A guide for Washington houses built for radiators, from one hot bedroom to the whole house, and what the historic district, the panel and the plaster walls change.](https://roomwisedcminisplits.com/guide/air-conditioning-old-houses-without-ductwork/)

## Get an estimate for your house

(771) 213-3105