Doing a major reno and extension (brick veneer/ double down stairs and weatherboard up stairs). Looking to get central heating and cooling (aircon). Lots of brands out there. Wondering which brand generally gives best bang for buck. And has top energy efficiency rating and is reliable/ lasts (not cheap and nasty).
Also, roughly how many zones should I look to get? I'm guessing more is more expensive. And do I heat/cool rooms such as laundry, wc, bathroom?