Cooling Options – Evaporative Cooling

Most builder’s standard cooling option is evaporative cooling.

This is probably because they are relatively cheap to install. They also fairly cheap on power consumption as you are basically only running a fan.

So whats the down side?

  • Evaporative systems work best in areas of low humidity so they will be less effective in coastal areas where most of us live.
  • They can only cool up to the ‘wet bulb’ temperature. (Check with the Bureau of Meteorology to find out what this may be, it might be OK for you)
  • To be effective you really need a door or window open in each room that you want to cool. Not too good if security is a concern, or you want to come home to a cool house.
  • A central unit will use around 25L per day which might be a consideration if you are on tank water. You can however shut the water off and rely on the breeze alone on some days.
  • There are some bush fire risks in having a large plastic structure on the roof. (DO NOT RUN AN EVAPORATIVE COOLER IF THERE IS A LOCAL BUSH FIRE – It will suck flying cinders to the unit increasing the fire risk)

Personally I am not a big fan of these units, because of the humidity they add I always feel a bit clammy.

I prefer to think my, good house orientation, high insulation and solar cells on the roof and are offsetting the power use of my refrigerated system.

In spite of my opinion there are a lot of evaporative coolers around.


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