Atlas Paving

Customised Airconditioning

Atlas Paving

Atlas Paving

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Ducted Evaporative Cooling

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This system of air conditioning provides cooler air indoors by forcing dry hot air through water soaked filter pads. The system is normally mounted centrally on the roof (best if it is not visible from the street), air is then pumped into the house through ducted ceiling vents. One vent is required per bedroom or standard sized room, more for bigger rooms like open plan living areas. Different size systems are available depending on how many outlets you need. Example: A 3 bedroom house with open plan living and a home theatre might need 6 outlets, one per bedroom, one in the theatre and two in the open plan living. Obviously the bigger the unit the more costly it will be to buy and install. Evap units are great in that you can keep all your windows open when the unit is operating. The air in your home is changed over about every 20 minutes, filling your home with fresh clean filtered air.


  • You can still have doors and windows open while operating
  • Cheaper to install and run than reverse cycle (as little as 5c per hr)
  • Less maintenance that reverse cycle
  • Environmentally sound choice, less emissions
  • System filters dust, pollen and pollutants, so good for allergy sufferers
  • Can be used just for ventilation
  • Perfect for WA's hot dry climate
  • Quiet


  • Roof mounted therfore visible from outside the house
  • Not effective in humid weather- but could be combined with a slip system for humid days


Different brands will vary in what they require but as a general rule you will need a power source and cold water outlet in the roof space

Covers are available for the roof unit in winter or some units have a built in sealing system to prevent drafts. Ceiling vents should be closed in winter to prevent heated air escaping into the roof ducting. Evap systems cannot currently be combined with a built in heating option, you will need an alternative heat source for your home.


Ensure that you choose a reputable installer. They will be able to advise you on what size unit you require. They will also be required to draw up an air conditioning plan and additional documentation of works required by your builder. This way everyone knows what they have to do. Your builder will charge you for any additional work they are required to do. You need to choose an installation company that will still be around to honour any service or warranty issues. It is best to plan your air conditioning at the beginning of your build. The builders plumber and electrician will need to know the position of the unit so they can arrange the power and water and planning early will ensure your ceiling vents can be integrated into your lighting plan.

Helpful Hints

Remember when planning your air con layout, have your ceiling vents placed on the opposite side of the room to the windows to create a cross breeze as the air exists

The air conditioner will regularly dump the old water from the unit. Check how often and how much water the system dumps. You will need to allow for its disposal. Either pipe it into a nearby soak well or have a hardy plant in a planter below the waste pipe. (Discharge water will contain higher levels of minerals and salts so something that would grow near the beach would be best)

Related Topics

Ducted Reverse Cycle



Solar Passive Design

Ceiling Fans

Split Systems