The comments on housing bring on a bit of a chuckle, because that is what many older homes are like where I live (north coast CA). The climate is mild and humid, too, so mildew is a big problem. In that way at least, NZ will be just like home
I'm preparing myself for the change, and hope I can manage gracefully, but do plan on retrofitting with insulation at the very least. I try to imagine that living in NZ will be rather like my life in the 60s, so it's not so strange.
Good going with the cautionaries, nolasmom.