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Sizing ducted air-conditioning and heating

Tomorrow I'll be investigating the options for new ducted evaporative cooling and ducted gas heating outlets in to the extension.  As part of my homework, I've looked for online calculators to help determine what size units are needed, which I can check against the actual size of the units we have installed.

For evaporative ducted cooling, Braemar provide an online calculator.

For ducted heating, Dual Heating and Air-conditioning have guidelines.

An interesting fact from the Dual Heating and Air-conditioning site is that a home with only ceiling insulation takes 100W per square metre to heat, whereas an energy efficient home take 60W per square metre.  Our extension is 5-star energy rated, so my calculations can be based upon 60W, whereas the older part of the house will take 100W per square metre.

For air-conditioning, the Whirlpool forum (the telecommunications/technology forum, not the fridge company's forum) have FAQ and a library of helpful links.  We'll look into them more when we are selecting an air-conditioning system for the first floor.

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