Multi-Head Split System or Ducted Reverse Cycle? An Honest Comparison

The short version

If your home has roof space and you want the whole house comfortable with nothing on the walls, ducted reverse cycle usually wins. If your home has no roof space, or you only want two to four rooms conditioned, or the outdoor unit positions are limited, a multi-head system usually wins. Everything else is detail, and the detail is below.

Comfort and coverage

Ducted. Conditions every room the ducts reach, including hallways and bathrooms, with air delivered through ceiling outlets. With zoning, living areas and bedrooms run separately. The result, when the ductwork is sized and insulated properly, is the most even whole-home comfort available.

Multi-head. Conditions the rooms that have an indoor unit and leaves the rest alone. Each room has its own unit and its own temperature. Doorways and hallways between conditioned rooms stay cooler or warmer than the rooms themselves.

Control

Both give room-by-room control when designed properly. Ducted zoning controls groups of rooms from one controller; a multi-head controls each room from its own unit, with central or app control on brands that support it. Ducted zoning has to be designed in; a multi-head has it by nature.

Appearance and noise

Ducted. Ceiling outlets and a return air grille; nothing on the walls, one outdoor unit. Indoor unit in the roof space, so the house is quiet when the ductwork is sized properly.

Multi-head. An indoor unit on the wall or a bulkhead in every conditioned room, one outdoor unit outside. Modern units are quiet, but they are in the room with you.

What can go wrong

Ducted. Undersized or poorly insulated ductwork, undersized return air, outlets in the wrong places and poor commissioning are the failure modes, and they are invisible after installation. A good ducted system is a design and installation product more than an equipment product.

Multi-head. An outdoor unit sized by adding up the heads optimistically, long pipe runs that cost capacity, rushed evacuation, condensate drainage as an afterthought, and the single point of failure: one outdoor unit fault takes every room offline until it is repaired.

Price and running cost

Equipment for a multi-head covering three rooms is usually less than a ducted system covering the whole house, but it is covering less. Comparing like for like, the price gap is often smaller than people expect, and the ductwork is a large share of a ducted quote. Running cost depends far more on sizing, ductwork and how you use the system than on which category it is.

The questions that decide it

1. Is there usable roof space for ductwork, and can it be worked in without damaging the home?
2. Do you want the whole house conditioned, or specific rooms?
3. How many rooms, and will they run at the same time?
4. Where can outdoor units go, and how many?
5. Are you replacing gas ducted heating? If so, a ducted conversion under the VEU program is usually the stronger answer, and the existing ductwork question comes into it.
6. What does the budget need to cover now, and what might you add later?

We answer those at the site visit, then recommend one system for your home. We install both, so the recommendation is about the house.