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Home Ventilation - Halswell

I'm looking for supply and install of a cost effective home ventilation system for a four bedroom single level house. - 189 m2, see floor plan - accessible roof cavity with existing power point - happy to consider positive air systems that can be upgraded (please quote both if available) - prefer control systems that work on both temperatures and humidities - as outdoor air is warmer/drier certain times of day even in winter, is the control ysytem able to take advantage of that?