We are running through variations with the builder at the moment for our new home and they mentioned to us that we should consider putting in 3 phase power if we are going to be running a ducted A/C unit.

Is this true, anyone here running a large A/C unit on 1 phase power?

If it makes any difference it is a single story house, would have an average home power consumption, only extras as i see it would be A/C and pool pump.