Ducted vs high-wall — which for your villa?

Most NZ homeowners pick high-wall splits by default because they're cheaper, faster to install, and what every installer quotes first. But for older villas, character bungalows, and any home where you're heating more than two rooms, ducted is often the better answer — it just costs more upfront. Here's the honest comparison.

What you're actually comparing

A high-wall split is one indoor unit (the head on the wall) connected to one outdoor unit (the condenser outside). It heats one space — typically the main living area. A ducted system is one outdoor unit connected to a hidden indoor unit (in the ceiling or under the floor) that pushes warm air through trunking to multiple rooms via ceiling or floor vents. A multi-split is the middle ground — one outdoor unit, multiple indoor heads, no ducting.

Upfront cost (NZD, indicative 2026)

• High-wall split, single room: $2,800 – $4,500 installed
• Multi-split, 3 indoor heads: $7,000 – $11,000 installed
• Ducted, 4–5 zone whole-of-home: $13,000 – $22,000 installed

Ducted prices vary wildly because the bulk of the cost is the install labour and ducting trunking, not the unit itself. New-build pre-cable installs are at the low end; retrofit into an existing villa with no ceiling cavity access is at the high end.

Aesthetics — the underrated variable

In a heritage villa or character bungalow, the visual cost of a 1.2m white plastic high-wall unit on the cornice is real. Ducted systems have only floor or ceiling grilles visible — a much smaller intrusion. For homeowners who've spent serious money restoring a villa, this often outweighs the cost difference on its own.

Retrofit complexity

• High-wall split: any house, low complexity. The condenser sits outside on a wall or ground bracket, refrigerant lines run through one wall.
• Multi-split: more refrigerant lines but each head is a wall install. Reasonable in any house.
• Ducted retrofit: requires either a usable roof cavity (most NZ pre-1980 villas don't have one) or an underfloor install. Bungalows with low-pitch ceilings are difficult; villas with high stud ceilings are usually doable but more expensive.

Zoning — the ducted advantage

Modern ducted systems support 'zone' control — different rooms can hold different temperatures, or be off entirely while others run. You're not heating bedrooms during the day or the office during the evening. Done well, this can wipe out the efficiency penalty of moving more air through ducting.

Our rule of thumb

• 1–2 rooms to heat → high-wall split per room (or one in the main living area)
• 3+ rooms in a modern home with roof cavity → ducted
• 3+ rooms in a heritage villa with no roof cavity → multi-split, or accept the underfloor-install ducted retrofit cost
• Bach / holiday home → high-wall split, simple, easy to leave for months unused