The Split System Air Conditioning Decision Melbourne Homeowners Get Wrong Every Summer

The homes that make it through Melbourne’s worst summer days without any dramas aren’t the ones with the latest and greatest kit. They’re the ones where someone got the planning spot on, capacity, placement, and installation quality all nailed from the get-go. By the time the mercury hits 40, it’s too late to fix these things. The homes that struggle in January and February are often the ones that got at least one or two of those things wrong, and the worst part is that the aircon units are still chugging along, working overtime, cooling the room down to a decent temperature, but quietly racking up electric bills that look far from reasonable.

Split systems are just about the best option for Melbourne homes where a ducted install isn’t an option, older flats with shallow ceilings, period houses, high-set units, and any room that’s out of reach of the existing ductwork. They’re usually a one-day job, need no ceiling space for ductwork, and the modern inverter-driven Split System Air Conditioning Melbourne units are often as efficient as, or even better than the older ducted systems, as long as the weather’s not too crazy.

What Inverter Tech Actually Does To Your Bill?

The Energy Rating Australia scheme lets us compare split system models on a standardised basis. One star difference in the rating is roughly a 10% swing in annual running costs under similar usage conditions. Over a Melbourne summer from November to April, that 10% difference comes out to a pretty sizable number of dollars.

You still see non-inverter fixed-speed systems being sold in Melbourne. They work alright. They just cycle the compressor on and off as the room reaches the set temperature, which means they use a big burst of electricity every time they kick back in and they never get the efficiency they should during the dull conditions that make up most of Melbourne’s warmer months. Over five years of regular use, the argument for inverter over fixed-speed is really not even close.

Matching Capacity to the Room: The Basic Calculation That Most Buyers Skip

Underestimating the capacity of the unit means it’ll just keep running flat out on the hottest days and still not manage to cool the room down to a decent temperature. That non-stop operation basically halves the life of the compressor and gives you an electricity bill that makes you wonder if it was all worth it.

Melbourne’s housing stock is all over the shop, ranging from houses that just about meet the minimum insulation and glazing standards to ones that are properly equipped to keep the heat out. A bedroom in a 1975 house with no ceiling insulation and single-glazed windows is going to need a lot more cooling capacity than a room in a 2015 house with double glazing and decent insulation. Floor area alone isn’t a reliable guide, you need to think about the ceiling height, window area, orientation of the room, how many skylights there are, and whether the room is directly underneath an uninsulated roof. Installers who just quote based on floor area without asking all those questions are just taking a guess, not doing the maths.

Why Installation Quality Is As Important As The Equipment Itself?

A wrongly installed split system causes refrigerant leakage, malfunctioning of the condensate drainage system and poor efficiency from day one. There is nothing visible about the malfunction; the unit works, it cools down the room and wastes more electricity than normal. The connection between the incorrect installation and these negative consequences may be seen only in a few years when a service person arrives and sees the cause of all troubles.

In Victoria, a licence for refrigerant handling is mandatory for the persons who perform the installation of the air conditioner. The request to show the licence before the start of the job is completely reasonable and can be done by any installer who has this certificate. In addition, the place of the outdoor unit influences its performance: the unit that is placed in full western sun in the afternoon when the highest temperatures of Melbourne summer hit is working with low efficiency when it is needed the most. The unit placed on the bedroom wall outside is the noise that you will hear every night of summer.

When Multi-Head Configurations Become A Must-Have?

The multi-split systems have one outdoor unit and two, three, or four indoor heads located in separate rooms. The configuration is usually used in the case of Melbourne terraces, Federation narrow-frontage houses and strata buildings where body corporate rules limit the number of outdoor units allowed on the external wall of the building.

The sacrifice in case of a multi-split configuration is very obvious: if the outdoor unit fails, all indoor heads will fail at the same time. The quality of the equipment and warranty terms become more important in this case than in the single-split configuration. This aspect should be discussed during the choice of the brands before accepting the quote, not two summers later when the compressor stops working and all indoor heads lose their cooling capability.

The correctly chosen and installed split system will change the summer in Melbourne. The wrongly chosen and installed one will make your expenses higher.