What each question is getting at
Rooms. The ACT Government's guide says splits suit single rooms or open-plan living spaces, so a whole house needs several. Rinnai pitches multi-split at homes needing 2 to 5 rooms covered, each controlled separately.
Home size. The same guide says splits suit houses below 180 square metres, or homes where only some rooms need heating or cooling, while ducted or multi-head systems suit larger houses.
Duct space. A ducted system's indoor unit usually sits in the ceiling or under the house, with insulated ducts running to each room, so it needs somewhere to go.
Gas ducted heating. Rinnai says its add-on cooling uses the existing ductwork and vents in most cases, if the heater is compatible. Going to ducted reverse cycle is different: the ACT guide says old gas ducts are too narrow to re-use.
What the answer doesn't tell you
The quiz can't see your roof space, your switchboard or your insulation. The ACT guide says ducted or multi-head systems in a large house may need a three-phase power upgrade, which only an installer can confirm on site.
It doesn't weigh up running costs either. The ACT Government says ducted systems that cool a whole house generally cost more to run than a split, and a house with several splits can be zoned just by switching on the ones you need.
What we'd do
What we'd do next
If the quiz says splits, ask for a split specialist who'll get the size and the outdoor unit spot right for each room. If it says ducted, you want a ducted specialist who'll check the ceiling space and any existing ducts before quoting. If it lands in between, say so on the quote form, and the installer who takes your job can talk you through both.