Split System Installation in Cairns

Sizing is a moisture problem here, not a temperature one

The capacity printed on the box is a total figure and it splits two ways. Part of it lowers the air temperature and part of it condenses water out of the air. For most of the year in Cairns the second part is doing the work that actually makes a room comfortable.

A unit that is too large reaches the set temperature within a few minutes and shuts down. The coil never gets a long enough run to stay properly cold, so very little moisture leaves the room. The thermostat reads 24 degrees, the room still feels heavy, and people respond by dropping the setting further, which does not help. Undersizing causes its own trouble, but oversizing is the more common mistake and it cannot be corrected after install day.

Sizing to the room honestly matters more than the headline number, and so does choosing an inverter that can turn down a long way. A unit running steadily at low output pulls far more water out of the air than one that sprints and stops.

The pipe run is part of the specification

Every manufacturer publishes a maximum line length and a maximum height difference between the indoor head and the outdoor unit, and past a certain run the system needs extra refrigerant weighed in at commissioning. Ignore that and capacity falls away, oil struggles to return to the compressor, and the warranty gets complicated.

It comes up constantly here because of the housing stock. A Queenslander with no wall cavity and a high-set floor can easily put ten or twelve metres between a sensible head position and a sensible condenser position. Rendered block gives you a core-drilled penetration and not much flexibility about where it goes. We work the route out at quote stage, because a pipe run discovered on install day becomes either a duct down a front wall or a job that stops.

Mounting for wind and salt

This is a cyclone region, and an outdoor unit is a flat-faced lump of metal bolted to a wall. Brackets are only as good as what they fix into, so the question is whether there is timber, a masonry substrate that will hold a chemical anchor, or a sheet cladding that will hold nothing at all. Fibro and unbacked Colorbond both need the load taken back to structure.

Salt is the other half of the same decision. Within a few kilometres of the water the aluminium fins corrode, lose contact with the copper, and the coil stops rejecting heat. A coated coil is worth specifying, and so is putting the condenser where the south-easterlies are not driving salt straight through it. A sheltered southern or western wall usually beats an exposed eastern one by years.

When one split is the wrong answer

A single head cools the room it is in. Air does not turn corners, and a large unit mounted in a hallway on the theory it will feed three bedrooms will run all day, dehumidify nothing properly and satisfy nobody. If you want more than one room done, that is a multi head or a ducted conversation, and we will say so rather than sell you a bigger single unit.

Room dimensions, ceiling height and a rough idea of how much glass faces west is enough to quote from. Call 0489 266 523 and you will get a straight answer on the size before anyone talks about brands.