Ducted vs split is one of the bigger decisions when planning HVAC for a NZ home. Wall-mounted (split) heat pumps are the default — cheaper, faster to install, work brilliantly for one or two rooms. Ducted is the premium option — whole-home conditioning, multi-zone control, invisible installation. Multi-split sits in between. Here's how to pick.
What each system actually is
Split (wall-mounted)
One indoor unit mounted high on a wall, one outdoor unit beside the house, refrigerant pipes connecting them. Cools and heats one room or an open-plan area. Most NZ homes have at least one. Typical install takes half a day.
Multi-split
One outdoor unit running 2–5 indoor units across different rooms. Cheaper than buying 2–5 standalone splits, tidier outdoor footprint (just one condenser), and you can independently control each indoor unit. Typical install takes 1–2 days.
Fully ducted
One indoor unit hidden in the ceiling cavity, ductwork carrying conditioned air to grilles in every room. Multi-zone controllers let different rooms run at different temperatures from the same system. Premium look — no visible wall units. Typical install takes 2–4 days.
When to pick split (wall-mounted)
Split is the right choice when:
- You only need to condition one or two rooms
- Budget is tight — splits are the cheapest entry point
- The home is rented and you're keeping things simple
- Ceiling cavity space rules out ducted retrofitting
- You want fast install and minimal disruption
When to pick multi-split
Multi-split is the sweet spot when:
- You need 2–5 rooms conditioned but ducted is overkill or impractical
- You only have one suitable outdoor location for a condenser
- Each room has different usage patterns and you want independent control
- You're retrofitting a home that can't take ducted ductwork
When to pick ducted
Ducted is the right answer when:
- It's a new build (always cheaper to install during construction)
- You have a larger home with 4+ rooms needing climate control
- Aesthetics matter — no visible wall units, no compromise on the architectural design
- You want premium multi-zone control across the whole home from one system
- You're investing in a long-term home and want the most efficient whole-home solution
The honest cost comparison
For a typical 3-bedroom Waikato family home wanting all main living areas + bedrooms conditioned:
- 4 separate splits (lounge + 3 bedrooms): ~$10,000–$13,000
- One multi-split (4-zone): ~$8,000–$11,000
- Fully ducted (4-zone): ~$13,000–$17,000
Multi-split is often the value pick for this scenario. Ducted is $3,000–$5,000 more for the install but delivers a premium aesthetic and arguably better long-term efficiency through proper zone control. Whether that's worth it depends on how long you're staying and how much you value the look.
Frequently asked questions
Is ducted better than split heat pumps?
Not universally — they solve different problems. Ducted is better for whole-home climate control, premium aesthetics, and multi-zone homes. Splits are better for single-room cooling/heating, lower upfront cost, and homes where ceiling cavity space is limited. The right answer depends on your home, budget, and how you actually use rooms.
Is ducted heat pump cheaper to run than split?
Per kWh of heating delivered, modern ducted and split systems are similarly efficient. Ducted often runs cheaper in practice because zone control means you only condition the rooms in use — versus split installs where each unit runs independently. But that depends on how you use the system.
Can I retrofit ducted into an existing NZ home?
Often yes, but it depends on ceiling cavity space and access. Newer NZ homes with adequate roof space retrofit cleanly. Older villas with low ceilings, decorative architraves, or limited cavity space can be tricky — sometimes a multi-split system is a better fit. We assess this during the free site visit.
What's the difference between split and multi-split?
A split system has one outdoor unit paired with one indoor unit. A multi-split has one outdoor unit running 2–5 indoor units (each in a different room). Multi-split is the middle ground between buying multiple stand-alone splits and going fully ducted.
How much more does ducted cost vs split?
A single split is $2,500–$4,500. A multi-split for 3 rooms is $5,000–$8,000. Fully ducted whole-home is $10,000–$20,000+. So ducted is typically 2–4x the cost of equivalent splits — but you're also getting whole-home conditioning, multi-zone control, and a far cleaner aesthetic.
Are ducted systems noisier than split?
Usually quieter. The indoor unit is hidden in the ceiling cavity, and only the air movement through the grilles is audible — typically very quiet. The outdoor compressor unit is similar in noise to a split's outdoor unit.
