Many Melbourne homes have evaporative cooling, and a common question when upgrading is whether to stay with evaporative or switch to refrigerated ducted reverse cycle. They cool in fundamentally different ways, and each has strengths. This guide compares them on the things that matter in Melbourne — performance on humid days, running cost, heating, and how you live with each — so you can choose well.
How They Differ
Evaporative cooling draws warm outside air through wet pads, where evaporating water cools it, then pushes that cooler air through the home with windows open so it can flow out. Ducted reverse cycle is refrigerated air conditioning — it removes heat from the indoor air with a refrigeration cycle and recirculates the cooled air through the home with the house closed. The mechanisms are completely different, and that difference drives everything below. See our how reverse cycle works guide.
Cooling on a Hot, Humid Day
This is the decisive difference for Melbourne. Evaporative cooling relies on evaporation, which slows as humidity rises — so on a hot, sticky, humid day its cooling weakens just when you most want relief. Refrigerated reverse cycle does not depend on humidity at all; it cools just as effectively on a 38°C humid day as a dry one, and lets you set and hold an exact temperature. For dependable cooling across all of Melbourne’s summer conditions — including the humid days — reverse cycle is far more capable.
| Factor | Ducted reverse cycle | Evaporative |
|---|---|---|
| Cooling on humid days | Effective at any humidity | Weakens as humidity rises |
| Temperature control | Set & hold exact temp | Less precise |
| Heating | Yes — heats too | No |
| Windows | Closed | Must be open |
| Running cost (cooling) | Higher, but efficient | Lower; uses water |
| Upfront cost | Higher | Lower |
Running & Water Cost
For cooling alone, evaporative typically uses less electricity — it runs a fan and a water pump rather than a compressor — though it consumes water, which matters in dry summers and adds a (small) cost. Ducted reverse cycle uses more electricity, but it is efficient (COP 3–5), and good zoning keeps the cost down. The fuller picture: reverse cycle costs a bit more to run for cooling but cools far better on humid days, uses no water, and also replaces your heater. See our running costs guide.
Heating — a Key Difference
Evaporative cooling only cools — it does nothing in winter. Ducted reverse cycle heats and cools from the one system. This means reverse cycle can replace both your cooler and your heater, simplifying the home to a single system and a single set of ducts. For homes currently running evaporative cooling plus gas ducted heating, switching to ducted reverse cycle consolidates both — and the gas-replacement rebate helps fund it. This year-round capability is a major point in reverse cycle’s favour.
Air Quality & Doors
Because evaporative cooling needs windows or vents open to work, it continuously brings in outdoor air — refreshing, but it also lets in pollen, dust and outdoor heat, which can trouble allergy sufferers on high-pollen Melbourne days. Refrigerated reverse cycle works with the house sealed, recirculating and filtering the same air, giving a more controllable, allergy-friendly environment and keeping the heat out. If anyone in the home has hay fever or asthma, the sealed operation of reverse cycle is a meaningful advantage.
Which Suits Your Home
Choose ducted reverse cycle for dependable cooling on every summer day (including humid ones), exact temperature control, year-round heating and cooling in one system, and a sealed, allergy-friendly home. Evaporative still suits homes prioritising the lowest cooling running cost on dry days, who do not need heating from the system and are happy with windows open. For most Melbourne homes wanting reliable, controllable, year-round comfort, ducted reverse cycle is the stronger choice. Call 0431 918 137 for advice.