Over the last few years HRV came on the scene. It is a large fan installed in the ceiling for circulating warm air, through ducting around the various rooms. This fan uses very little current and is very cheap to run; but you need to have an efficient, independent heating system installed already, to provide a source of warm air in the first place. Otherwise circulating cold air around would not achieve any thing. The recommended machine is a heat pump because this is the cleanest and most efficient heat source available now in NZ. The third thing you need is insulation in your ceiling to prevent heat loss from inside your house.
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