Good on the NZ for now pushing , via the TV adverts, the benefits of insulation
I'm glad they're pushing for that too. But I don't think they will have to go that far. Already building companies are exceeding the minimum insulation requirement. It just doesn't make sense to have power bills in the $500 - $1000 a month during the winter.

BTW, you realise there's only so much fiberglass insulation you can fit between a 2 x 4 stud? R2.6 (metric measurement) is the maximum. You can use far higher by using the polystyrene 'expanding foam' but I don't trust it's long term effects. Like all plastics, it will break down and give off fumes whereas fiberglass is just glass.

We should be embracing global warming. If Canterbury winters would rise 2 or 3 degrees overall during the winter, that would help a lot to people's heating bills.