What shapes an install here?
Humidity changes the sizing
Afternoon humidity at Sunshine Coast Airport averages 70% in January, with a 3 pm dew point of 21.0 degrees. Rinnai says an over-sized system can short cycle (switch on and off too often) and dehumidify less effectively, so the right size here is one that runs steadily.
Subtropical demand
ActronAir says tropical and subtropical parts of Australia make much greater demands on a system than cooler regions, so ask for a heat load on your rooms, not a size off a chart.
Beachside streets
Mitsubishi Electric's instructions name salty places such as the seaside among the places to avoid. In beachside parts of Mooloolaba, Maroochydore, Caloundra and Golden Beach, the outdoor unit's wall matters as much as the model.
Houses, townhouses and unit blocks
At the 2021 Census, separate houses were 73.1% of occupied homes in the council area, townhouses and similar 13.0%, and flats or apartments 12.8%. In a multi-storey block, The Good Guys says the body corporate has to sign off before work starts.
New estates
Aura, in the Caloundra South Priority Development Area, is planned for approximately 20,000 dwellings. On a new build, plan the pipe routes and circuit before the walls close in.
Which system suits which Coast home?
An apartment, or one room: a split system, which needs no roof space.
A townhouse, or a few rooms with their own controls: a multi-split. Rinnai says it suits homes needing two to five rooms covered.
A detached house, all of it: ducted, zoned so bedrooms can run at night on their own.
Reverse cycle is the default either way. The Queensland Government's list of natural gas areas doesn't include the Sunshine Coast, so unless you're on bottled gas, winter heating means electric.
What makes an install bigger or smaller here?
The outdoor unit's spot comes first. Moving it to a wall sheltered from the sea can lengthen the pipe run, and that length should be written on the quote rather than discovered on the day.
Then the building. A second storey, a unit block or a townhouse with a shared wall all add access, approval or neighbour questions.
Then the power. Mitsubishi Electric says an air conditioner needs a dedicated power supply, so an older switchboard may need work before a new circuit goes in. See the electrical side for what that involves.
Which licences does a Queensland install need?
Three, held by the right people. The business needs a QBCC licence, because the QBCC treats installing heating and cooling as mechanical services work, licensed regardless of value. The technician needs an ARC refrigerant licence: RSS03 covers single-head splits under 18kW, and anything bigger or multi-head needs RAC01.
The wiring is separate again. The QBCC says a restricted electrical licence for refrigeration and air conditioning lets someone test, repair and maintain, but not do installation work such as running the interconnect cable between units. That's for a licensed electrician.
The QBCC licensee register can be searched by licence number or name and shows the full licence history. Our installation page covers the job from quote to handover.
What to ask a Sunshine Coast installer
- What size do you recommend, and did it come from a heat load for these rooms?
- Does this model have a coated outdoor coil, and what does its warranty say about salt?
- Which wall would you put the outdoor unit on, and why that one?
- What's your QBCC licence number, and who holds the electrical licence for the wiring?
- Is your RTA number on the quote? The ARC requires it.
- For a unit or townhouse, what do you need from the body corporate before you start?
What we'd do
Where we'd start
Get the heat load done first and pick the size from it, because a unit too big for a humid room leaves it cold and clammy at the same time. Then choose the outdoor unit's spot before the model: sheltered from the sea, open to fresh air and easy to reach for a service. Where we have them near you, licence-checked installers who do installs like yours week in, week out see each job, and only the one who takes it gets your details. If no Coast installer has taken it after 48 hours, installers elsewhere in Queensland may see it too.
