Is ducted air conditioning worth it in a small home or unit?

In a large house, ducted makes sense because it reaches rooms a few splits never could. In a two- or three-bedroom home, rooms sit close together, and a split in the living area plus one in the main bedroom often covers most of how the house is used. The case for ducting every room is weaker.

Efficiency points the same way. Wall units are more efficient than ducted, because ducted has a larger fan and loses some energy through the ducts. In a big house, ducted's reach justifies those losses. In a small one, that reach often isn't needed.

If most of these apply, ducted can be the right call even in a small house. Rooms stay clear of equipment, air spreads evenly through ceiling outlets, and one controller runs the lot.

Zoning needs care in a small home. A ducted unit needs a minimum airflow, so tiny zones of one small bedroom each can lead to noise or shutdowns. Two zones, living and sleeping, usually work better than several small ones.

The Victorian Government's guide for ducted systems is 1.1 to 1.4 kW of heating output for every 10 m² covered, depending on the home. Insulation, glazing and orientation decide where a house sits in that range, so a well-insulated townhouse and a post-war weatherboard of the same size can need quite different systems.

Ducts should be insulated to at least R1.5 with sealed joints. In a small home, short, well-sealed runs keep losses low, which helps a small ducted system hold its own against splits. Long, sagging or poorly insulated runs undo that advantage quickly.

Many units and apartments have no roof space at all. Bulkhead ducted puts a slim indoor unit in a bulkhead, often above a hallway, with short ducts to two or three rooms. It keeps the walls clear, but needs somewhere to build the bulkhead and a spot for the outdoor unit.

Where there is only one balcony or courtyard for outdoor equipment, a multi-head can run a head in each room from one outdoor unit. Check with your owners corporation where outdoor units can go before choosing, because that can decide the system for you.

For most two-bedroom homes and units, we would start with splits: one in the living area and one in the main bedroom, adding a third if the second bedroom is used daily. For a three-bedroom house with good roof space where every room is in use, ducted with two zones is worth pricing alongside.

Landlords preparing small rentals for the 2027 standards can keep it simple. Consumer Affairs Victoria's guide for rental providers says one reverse-cycle air conditioner can meet both the heating and cooling standards, so a single well-sized split in the living area is often where a small rental starts.