What Does Evaporative Cooling Cost to Run in Albury-Wodonga?

Evaporative cooling has a reputation across Albury-Wodonga as the cheap way to cool a whole house, and on a dry 38-degree afternoon in Lavington or Thurgoona it usually earns that reputation. But "cheap to run" is not the same as "free to run", and a lot of households have no real idea what their roof unit is costing them in power, water and upkeep each summer. This guide explains where the running costs actually come from, how to work out the numbers for your own unit, and the faults that quietly push those costs up.

Where the running cost comes from

A ducted evaporative cooler does two jobs. A pump circulates water over the cooling pads, and a fan draws outside air through those wet pads and pushes it down the ducts into the house. As the water evaporates it pulls heat out of the air. There is no compressor, which is the big difference from refrigerated or reverse cycle systems, and the compressor is where most of the electricity goes in those systems.

That leaves three costs: electricity for the fan and pump, the water the unit evaporates and drains away, and the servicing that keeps it working properly.

Electricity: mostly the fan

The fan motor is by far the largest electrical load in an evaporative cooler. The pump draws comparatively little. That means the speed you run the fan at matters much more than how long the pump runs.

The simplest way to estimate your own power cost is to find the rated input of the unit. It is on the rating plate on the cooler itself, in the installation manual, or on the manufacturer's product page if you know the model. Multiply the rated wattage by the hours you run it on a typical hot day, convert to kilowatt-hours, and multiply by the usage rate on your electricity bill. Running on a lower fan speed most of the day and only going to high in the late afternoon makes a noticeable difference, particularly on newer units with variable speed motors.

Why open windows matter for cost

Evaporative cooling needs somewhere for the air to go. With the house shut up, the cooler pressurises the rooms, humidity rises, comfort drops, and people respond by turning the fan higher. Opening a window or door a little on the leeward side of the house lets the air flow through, which usually means a lower fan speed does the job. It is the cheapest running cost improvement there is.

Water: evaporation plus the bleed

The water side surprises people. The unit uses water in two ways. The first is the water that actually evaporates off the pads, which is what does the cooling. That figure goes up on the hottest, driest days, exactly when you are running it most.

The second is the water the unit deliberately drains. As water evaporates, the minerals in it stay behind and concentrate in the tank. To stop scale building up on the pads and pump, coolers either bleed off a small trickle continuously or dump the tank periodically and refill with fresh water. Some units have a salinity sensor that dumps only when it needs to. If the bleed or dump valve is set too generously, or is stuck open, the unit can send far more water down the drain than it needs to.

Compare your summer and winter water bills. If the summer jump looks out of proportion, have the drain valve and float checked.

Pads, servicing and the hidden costs

Cooling pads wear out. Over time they collect scale and dust, their airflow drops and they stop holding water evenly. Worn pads make the unit work harder for less cooling, so you end up running the fan faster and longer. Pad replacement is a normal part of owning an evaporative cooler rather than a sign something has gone wrong.

A pre-summer service is the single best way to keep running costs down. Our Evaporative Cooling Service & Repairs work covers cleaning the tank, checking the pump, float and drain valve, inspecting the pads, checking the fan belt or direct-drive motor, and making sure the ceiling outlets and ducting are open and clear.

Winter costs too

Evaporative coolers should be drained and shut down for winter, and the ceiling outlets closed. Many Albury-Wodonga homes run gas ducted heating through the cold months, and an evaporative system left with open outlets lets heated air escape into the roof. A seasonal cover on the roof unit and closed dampers keep that heat in the house where you paid for it.

When evaporative stops being the cheap option

Evaporative cooling works best in dry heat, which is most of an inland summer. On the muggier days after a storm, it cools less effectively, and households run it harder for a smaller result.

If you are finding the cooler cannot keep up, or the house is never comfortable in humid spells, it may be time to compare options rather than keep pouring money into an old unit. We cover the trade-offs in detail in our comparison of evaporative and refrigerated cooling for Albury-Wodonga summers, and our article on refrigerated ducted running costs explains how to estimate the other side of that comparison. For homes ready to switch, our Evaporative to Refrigerated Changeover service handles removal, ducting assessment and installation. For homes that want to stay evaporative, a new, correctly sized unit through our Evaporative Cooling Installation service is often the better long-term buy than repeatedly repairing a tired one.

Getting your unit checked

If you are not sure what your evaporative cooler is costing to run, start with a service before summer arrives. We work across Albury, Wodonga, Lavington, Thurgoona, East Albury and Baranduda, and we will tell you plainly whether your unit is running efficiently, what needs attention, and whether it is worth keeping. Call us or send an enquiry through the website to get it looked at before the first heatwave.