When I had ducted Air installed I was told that 3 phase would be better, but my budget didn't stretch to getting it run in, so I went with the largest Single phase model.
In hindsight I should have sold a kidney to get the 3 phase, it struggles on really hot days, my house single story, and is not huge.
My mate has the same brand as mine, but in 3 phase, it seems to get lots colder , quicker.
If I was building again, I'd get 3 phase connected from the outset.
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