Split System vs Ducted Air Conditioning: Which Is Right for Your Business?

A split system pairs one indoor unit with one dedicated outdoor unit to condition a single room or zone. A ducted system uses a single air handler — concealed in the ceiling or under the floor — to distribute conditioned air to multiple rooms through a network of ducts and grilles. Both can be zoned and scheduled; the right choice depends on your building type, layout, budget and how you use the space.

Neither option is universally better. The same building might warrant splits for individual consulting rooms, ducted for an open-plan reception area and a VRF system for a multi-floor commercial tenancy. Understanding the strengths and limitations of each helps you make a cost-effective decision rather than defaulting to whichever system you've used before.

Split systems are the right choice for small to medium commercial spaces where individual room control matters more than a seamless aesthetic: medical consulting rooms, small offices, retail shops under 100sqm, cafes, hair salons and similar spaces. A quality inverter split system — Daikin, Mitsubishi Electric, Fujitsu — can be installed for $1,500–$3,500 per unit, making it the most accessible entry point for commercial cooling.

Splits also suit tenanted buildings where separate metering is required, since each unit can be metered independently. They are the practical choice for refurbishments where running new ductwork through an existing ceiling is structurally or financially impractical. And for businesses on shorter leases, the lower upfront cost and ability to relocate units at the end of a lease reduces financial risk.

Ducted systems are the right choice for larger open-plan spaces where aesthetic consistency matters and the building supports concealed ductwork: offices over 200sqm, restaurants, hospitality venues, hotel lobbies, showrooms and retail flagships. The invisible finish — only slim grilles visible in the ceiling — is particularly important in premium or client-facing environments.

Ducted systems with zone dampers provide excellent whole-building control and are highly effective when paired with a building automation system. Installation costs are higher — typically $12,000–$40,000 for a commercial space, depending on size and zone count — but the result is a uniform, professional environment that a collection of wall-mounted splits cannot replicate. Ducted is most cost-effective when planned into a new build or major fitout from the start, rather than retrofitted into an existing building.

For medium to large commercial buildings that need the flexibility of individual room control at scale, VRF/VRV is often the right answer. Each indoor unit is independently controlled, but all share common outdoor plant — reducing the outdoor equipment footprint versus a split-system-per-room approach and providing more sophisticated system management.

Advanced VRF systems support heat recovery — some indoor units can operate in heating mode while others cool simultaneously, transferring heat energy between zones rather than rejecting it to atmosphere. This is particularly efficient in buildings with mixed orientations or significant internal heat loads. The upfront cost is higher than either splits or a basic ducted system, but operating costs are typically the lowest of any system type over the system's life.

Split system (per room): $1,500–$3,500 installed for a quality inverter unit. Multi-split (one outdoor, two to eight indoor units): $6,000–$18,000 depending on capacity and configuration. Ducted system (whole building): $12,000–$40,000 or more depending on size, zone count and ceiling complexity. VRF/VRV system: $25,000–$80,000 or more for a full commercial installation.

Operating costs often matter more than upfront cost for high-usage commercial environments. A ducted system that runs 12 hours per day, six days a week will accumulate significant energy costs over its lifetime — and a well-chosen, correctly-sized system can save tens of thousands of dollars in electricity compared to the wrong specification. Shelair provides detailed whole-of-life cost modelling as part of every commercial proposal.

As a general guide: if you have one to four rooms to condition independently, start with split or multi-split systems. For larger open-plan spaces where aesthetics matter, ducted is usually the right choice. For complex multi-room buildings where you need individual control at scale — or buildings with simultaneous heating and cooling demands — VRF is worth the investment.

There is rarely a single correct answer, and the best outcome often involves a hybrid approach — ducted in open areas, splits or VRF in private offices or specialist rooms. Shelair provides free site assessments and no-obligation proposals across Brisbane, Gold Coast and Sunshine Coast, covering all system types and helping you choose the right specification for your building and budget.