An evaporative cooler and an air conditioner cool your home in completely different ways. The evaporative unit draws warm air through water-soaked pads, dropping the temperature a few degrees while adding moisture to the air. A refrigerated air conditioner runs a refrigeration cycle that strips both heat and humidity out of the room. Evaporative coolers are cheaper to buy and far cheaper to run. Refrigerated systems cost more but deliver reliable cooling in any weather, including a muggy Queensland February.
That last difference settles the argument for most local homes. Evaporative cooling depends on dry air, and Sunshine Coast summer air is anything but dry. We compare the two options on cost, comfort and upkeep, and why we install refrigerated systems almost exclusively on the Coast.
How Does an Evaporative Cooler Work?
An evaporative cooler pulls warm outside air through pads soaked in water. As the water evaporates, it absorbs heat, so the air leaving the unit is cooler and more humid than the air that went in. A fan pushes that air through your home, with windows open so it can escape.
The catch sits in the physics. Water only evaporates readily into dry air. The drier the day, the more evaporation and the bigger the temperature drop. On a humid day, the air is already close to full of moisture, so barely any evaporation happens and barely any cooling with it.
How Does a Refrigerated Air Conditioner Work?
A refrigerated air conditioner, whether a wall split or a ducted unit, uses refrigerant to absorb heat from the air inside your home and release it outside. As indoor air passes over the cold coil, moisture condenses out and drains away. The system cools and dehumidifies at once, which is why an air-conditioned room feels crisp rather than clammy.
Refrigerated systems run with the windows closed, hold the temperature you set, and work regardless of the weather. Reverse cycle models also heat in winter, so one unit covers the whole year.
What Do They Cost to Buy and Run?
Treat these as approximate ranges. Pricing depends on your home, the brand and the install. The upfront figures line up with SolarQuotes’ 2026 install cost guide, the running costs with AirconAdvice’s 2026 data.
Upfront costs (supplied and installed, approximate)
- Portable evaporative cooler: roughly $100 to $600, no installation needed
- Ducted evaporative cooling for a whole home: roughly $3,000 to $6,000 plus
- Refrigerated split system for a single room: roughly $1,500 to $3,500 installed
- Ducted refrigerated air conditioning for a whole home: roughly $10,000 to $18,000 plus
Running costs (approximate, per hour)
Evaporative cooler: roughly 5 to 20 cents per hour, since it only runs a fan and a water pump
- Refrigerated split system: roughly 40 to 55 cents per hour
- Ducted refrigerated system: roughly $1.00 to $1.50 per hour
On paper, evaporative wins the budget contest easily. But cheap running costs only count if the system actually cools your house. And there is a forgotten cost, as a whole-home evaporative system can consume tens of litres of water per hour on a hot day.
The Humidity Problem: Why Evaporative Cooling Struggles on the Sunshine Coast
In dry inland air, say 30 per cent relative humidity, an evaporative cooler can drop incoming air by 10 degrees or more. A typical Sunshine Coast summer day runs 30-plus degrees with humidity around 60 to 70 per cent or higher. Saturated air cannot absorb much more water, so you might only get a couple of degrees of cooling.
The unit is actively pumping extra moisture into air that is already muggy. Run one on a sticky afternoon, and the lounge room can feel damper than before you switched it on.
A refrigerated air conditioner does the opposite. It pulls moisture out as it cools, and on the Coast that dehumidification is half the comfort. A room held at 24 degrees with the moisture stripped out feels fresh. The same 24 degrees at high humidity still feels oppressive. That is why evaporative systems are everywhere in Adelaide and Mildura and almost nowhere in coastal Queensland. Not marketing, physics.
Maintenance & What You’re Signing Up For
Evaporative coolers need seasonal attention. The pads clog with dust and minerals, and in humid conditions can grow mould or bacteria if neglected. Expect to clean or replace pads, flush the tank and check the pump each season, then drain and cover the unit over winter.
Refrigerated systems ask less of you. Clean the return air filters every two to three months during heavy use, and book a professional service about once a year to check refrigerant, coils, drain and electrics. That visit keeps efficiency up and catches faults before they become compressor-sized bills.
Evaporative Cooler vs Air Conditioner at a Glance
Evaporative cooler
- Evaporates water into incoming air, adding humidity as it cools
- $100 to $600 portable, $3,000 to $6,000 plus ducted
- About 5 to 20 cents per hour to run, plus water use
- Suits dry climates, struggles in humid ones like the Sunshine Coast
- No set temperature, windows stay open, no winter heating
Refrigerated air conditioner
- Refrigeration cycle removes both heat and moisture
- $1,500 to $3,500 for a split, $10,000 to $18,000 plus ducted
- About 40 cents to $1.50 per hour to run, depending on the system
- Works in any climate, with precise thermostat control
- Windows closed, and reverse cycle models heat in winter
The Verdict for Sunshine Coast Homes
For homes in Caloundra, Kawana, Buderim, Mooloolaba, Maroochydore and anywhere else along our stretch of coast, a refrigerated system, usually a reverse cycle split, is the better choice. It is the only option I put my name to here. Our humidity undermines the one job an evaporative cooler has, and low running costs mean nothing if the house still feels muggy.
A quality split system cools reliably on the stickiest February afternoon, strips out the humidity and heats the house on crisp winter mornings. Cooling several rooms or building new? Price up ducted reverse cycle with zoning too, since zones let you condition only the rooms you use.
Is there still a place for evaporative? A cheap portable unit can take the edge off a garage or shed on a drier day, and they suit families out west. For a Sunshine Coast living room, I would be doing you a disservice recommending one.
Frequently Asked Questions
Usually yes, by a wide margin: roughly 5 to 20 cents per hour against 40 cents or more for a refrigerated split, since it only runs a fan and a water pump. But in humid air it delivers a fraction of the cooling. Cheap to run is not good value if the house stays sticky.
Poorly. Evaporative cooling relies on dry air absorbing moisture from the wet pads. As humidity climbs, evaporation slows, and the cooling effect shrinks, while the unit keeps adding moisture to already-muggy air. That is why they are rarely recommended anywhere in coastal Queensland.
Yes. A split system dehumidifies as it cools, because moisture condenses on the indoor coil and drains away outside. Most units also have a dry mode for days when the temperature is bearable, but the air feels sticky. On the Sunshine Coast, that moisture removal is a big part of the comfort.
No, and this surprises people. An evaporative cooler needs open windows or doors so the humid air it produces can escape. Seal the room and the humidity builds until the unit achieves nothing. A refrigerated air conditioner works the opposite way and performs best in a closed room.
Clean the return air filters yourself every two to three months during heavy use, and book a professional service about once a year. Coastal units cop salt air, which corrodes outdoor coils and fittings faster than inland conditions, so an annual check is cheap insurance against a failed compressor.
Weighing up cooling for your home? Enquire now or call our Bells Creek team on 07 5439 7778 for straight answers and a free quote.
