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How much air conditioning do you need?

Back in August last year I looked in to extending our ducted heating and evaporative cooling in to our extension.  As I posted about then we calculated our heated and cooling needs and worked out how to extend our ducting.

Since then I have seen this blog post by MG Owen that describes his experience with using the Fairair online calculator, which I had not been aware of.  Fairair is run by the Australian Institute of Refrigeration, Air Conditioning and Heating Inc. There are three calculators on the Fairair site, relating to energy use, noise and size of the the unit.  It does not provide guidance on sizing of the ducting.

We have not quite got ours right.  We are getting too much air flow into the bedrooms and not nearly enough into the extended living area.  I will need to install some baffles to reduce the flow into the bedrooms so that more is pushed through to the living area.

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