How to Maintain Your Evaporative Air Conditioner: Follow Our Guide
Published on : August 15th, 2025
Table of Contents
Valuable Advice on Caring for an Evaporative Cooler
An evaporative air conditioner is an inexpensive and eco-friendly alternative to traditional air conditioning systems.
Operating on the same principles that make humans sweat, evaporative air conditioners (aka evaporative coolers) draw warm air through a series of water-soaked pads, cooling it before blowing it out into the room. There are relatively few moving parts, making this type of system easy to maintain.
Without frequent maintenance, though, your air conditioner can get clogged and even stop working altogether. Perform the following maintenance routine every two months during the cooling season and be sure to follow the steps for properly shutting down the unit when winter arrives.
Should you experience a water leak or other emergency, contact a professional right away. Otherwise, the bulk of the maintenance can be performed by the average homeowner.
How an Evaporative Cooler Works
Have you ever felt the fresh breeze while sitting by a lake on a warm day? That’s natural evaporative cooling at work, and it’s the same basic principle behind evaporative coolers, a simple yet effective way to cool your space.
Here’s a brief overview of how evaporative cooling works:
- When water evaporates, it absorbs heat from the surrounding air. This is the core idea behind an evaporative cooler. The cooler draws in warm outside air through cooling pads that are saturated with water.
- As the air moves through these pads, some of the water evaporates, pulling heat out of the air and causing the temperature to drop.
- The fan inside the evaporative cooler then pushes this cooled air into the space, providing a stream of fresh air that’s more comfortable during hot weather.

A Guide to Maintaining Your Evaporative Air Conditioner
Here’s a guide to keeping your evaporative air conditioner in top shape:
- Exterior cleaning: Begin by thoroughly wiping down the outside of your evaporative cooler. Use a soft, damp rag with plain water or a very mild dish soap solution. Avoid harsh or abrasive cleansers, which could damage the unit.
- Visual inspection: Disconnect the power to your air conditioner, and then carefully open it according to the manufacturer’s instructions. Make a quick visual inspection of the entire system, taking care to check the water level and to look for any spots where water does not seem to be flowing freely.
- Cooling pad removal and replacement: Gently lift out the cooling pads and inspect them for cracking, mould, or other signs of damage. If they look acceptable, wash them in a mild soap solution, taking care to rinse them thoroughly. If they are showing signs of wear, they need to be replaced. In this case, remove the entire frame and retainer. Wash and dry it, and then insert the new pads before carefully reinstalling it. Use caution to ensure that the frame and retainer are properly installed with no gaps.
- Float valve check: Manually manipulate the float valve to check for mineral deposits or debris. If it sticks at all rather than moving easily, thoroughly clean it with a mild soapy solution. If you see scaling, consider adding water treatment tablets. Consult the manufacturer’s instructions to determine what type of tablets to use in your system.
- Belt and motor care: Push on the air conditioner’s belt to ensure that it is nicely tight. It should give just slightly under pressure from your fingers. Inspect it carefully for cracking or other signs of wear and replace it if necessary. Lightly oil all moving parts of the motor to ensure that they turn freely.
- Waterway and filter cleaning: Pour warm, soapy water through the system according to the manufacturer’s directions and then release it via the drain plug. Scrub any spots that show dirt or debris with a soft rag. Then flush the system completely with cool, fresh water. Remove the filters and wash them in a mild soap solution, then replace them tightly.
- Water level set: After you flush the system, fill the water tank to its designated mark. If necessary, adjust the float arm. Ensure that the cooling pads are dampened before turning the system back on.
- Seasonal shut down: At the end of the summer, take a bit of time to inspect and shut down the system so that it is ready for the following year. Unplug the electricity and clean the waterway, filters, and pads as described above. Use a soft rag to thoroughly dry all of the components, and then let the system air out for a day or two. Some people remove the evaporative cooler and pack it away during the winter, while others simply cover it. Refer to your owner’s manual for suggestions on proper winter storage.
Fresh Air, All Day Long
Evaporative coolers need a constant supply of fresh air to be effective. Unlike air conditioners that recirculate the same air, evaporative coolers continually cycle in new air from the outside, keeping the atmosphere in your home or workplace feeling fresh.
This system is not only simple but also energy-efficient, using only water and a fan to lower the temperature. As you can see, the basic operation of an evaporative cooler is quite straightforward, using the natural process of evaporation to bring coolness and comfort into our lives.

Evaporative Coolers vs Traditional Air Conditioning
When it comes to cooling your house, choosing the right system can make a big difference in comfort, cost, and efficiency.
Let’s take a look at how evaporative coolers stack up against traditional air conditioning models.
Efficiency and Running Costs
- Evaporative coolers are highly energy efficient, using only water and a fan to cool the air. This can lead to lower running costs compared to traditional air conditioning units which use more energy-intensive components to chill the air.
- Air conditioning units use refrigerant and consume more electricity to achieve a cooling effect, making them less energy-efficient and costlier to operate over time.
Cooling Effect and Comfort
- Evaporative coolers are best in environments with low humidity, where they provide a natural and cooling effect along with fresh air circulating throughout the house. This can enhance comfort during hot days.
- Traditional air conditioning systems recirculate the same air within the house and can provide a more consistent temperature even in very high humidity, offering heating comfort in a variety of climate conditions.
Noise and Environment
- Evaporative coolers tend to be quieter than most air conditioning models, reducing noise pollution inside the house.
- Standard air conditioning systems, depending on the model, can be noisier and they have a higher environmental impact due to their energy consumption and refrigerant use.
In comparison, both systems have their advantages. The choice between an evaporative cooler and a traditional air conditioning unit often comes down to the specific needs of your house, local climate conditions, and your priorities regarding energy efficiency, cost, and environmental impact.
Advantages of Using Evaporative Coolers
Contemplating the idea of using an evaporative cooler? Here are some key benefits that highlight why this option might be suitable for your needs.
Energy Efficient and Reduced Running Costs
- Evaporative coolers are extremely energy efficient because they use the natural process of water evaporation to cool the air. This fundamental process requires significantly less energy to operate, as compared to a standard air conditioning unit.
- As a result of this efficiency, the running costs of an evaporative cooler are drastically reduced. By using less energy, not only do you save on your utility bills, but you also contribute positively to the environment.
Better Heating Comfort
- Evaporative coolers also provide a unique form of heating comfort. Rather than simply recycling the same air, as a traditional air conditioner does, they constantly intake fresh air from outside and cool it down through the evaporation process. This results in a continuous flow of naturally cool, fresh air in your home.
- In areas with low humidity, evaporative coolers can significantly increase the comfort level by bringing down the temperature and improving the overall air quality.
To sum up, evaporative coolers offer a cost-effective, energy-efficient, and environmentally friendly way to keep your indoor air cool and fresh.

When to Call a Professional
An evaporative cooler is an excellent and relatively uncomplicated eco-friendly alternative to a traditional air conditioner system.
However, it is important to perform regular maintenance to maximise its cooling potential. Of course, should you experience a water leak or other emergency, it is important to call a specialist right away. For the most part, though, the average homeowner should have little trouble maintaining an evaporative air conditioner.
Air Con Repair Near Me is a trusted provider of air conditioning and heating in the greater Adelaide region. We offer a wide range of heating and cooling solutions, along with special discounts and financing offers. Call us now or request a quote to get started.
Please note: This information is provided for advice purposes only. Regulations differ from state to state, so please consult your local authorities or an industry professional before proceeding with any work. See our Terms & Conditions here.
Do you have any questions about evaporative coolers? Keep reading for the answers
FAQs About Evaporative Air Conditioners
An evaporative air conditioner cools the air by drawing warm outside air through water-soaked cooling pads. As the air passes through, the water evaporates and absorbs heat, producing a cool, fresh breeze that’s circulated throughout your home. It’s a natural cooling process, which makes it energy-efficient and environmentally friendly.
Evaporative air conditioners work best in hot, dry conditions because they rely on evaporation to cool the air. In very humid climates, the cooling effect is reduced, as the air already contains a lot of moisture. However, they can still provide some relief by improving air circulation.
They do use water, but not as much as you might think. On average, an evaporative cooler might use between 15 to 25 litres of water per hour during operation. This can vary depending on the model, local climate, and how often you run it.
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