Hi Alan,
Thanks for the message. Firstly we would need to know the size of your home to be able to determine the air conditioning system you will require to cool your home effectively.
If your home has reasonable insulation then one of our ducted split system air conditioners should be able to reach the temperature you require quite effectively although when the outside temperature reaches up around 42-46 degrees then the effectiveness of the cooling the air conditioning system can produce will be reduced as all air conditioners are usually rated for a maximum outdoor operating temperature of approximately 45 degrees.
To get a accurate temperature measurement you will need to take into account the direction of the home (north and west facing homes are usually the hottest), how well is the property insulated, are there lots of windows that receive direct sunlight, will the air conditioners outdoor unit be installed in a shady place and some other minor factors.
If your home is quite large then you can arrange to have your ducted air conditoner zoned by your installer which will increase the application area by accommodating one group of outlets on one zone and another group of outlets on another zone. Zoning your ducted air conditioner is typically set up into daytime and nightime zones with one common area for both zones.
Generally speaking, if this system is installed in a suitably sized home then it should be able to maintain a temperature of approximately 22 degress on a 40 degree day.
If you have any other questions please feel free to contact us on 03 9763 8988 or you can email through a house plan to
mfreeman@domainair.com.au and we can determine the best air conditioner system for your home
kind regards,
Domain Air Conditoners.