" Good morning Todd, Snow here today!  Just a little bit.  But no extra heating is needed.  Magic! ❄️❄️" - Denise. 10:00am, 18th August 2025, Te Anau.

Energy modelling details:

" The heating demand would be approx. 1/3 compared to as if the same house on your site was designed and built to the current building code minimum standard. 

You may notice the absolute heating demand is over 55kWh/m2/a, which is higher than other Pohutukawa houses we previously built in Queenstown/Central Otago. Those sat around 40-45 kWh/m2/a on average. This is simply because the annual sunshine (solar radiation) in Te Anau is about 25% less than the sunny Central Otago. Also, the outdoor air is damper, which means it’s slightly harder to heat up to above 20 degrees. On the bright side, the ventilation calculation reveals that your “indoor humidity” should be sitting between 50%-70% all year round. This is a very favourable range. " - Arthur Lee - Certified Passive House Designer.


" For summer comfort, the energy model suggests there would be little to no overheating in summer above 25 degrees even without using blinds or curtains.

Even the worst case scenario, which reflects 2 degree global warming and higher occupancy rate etc. the overheating situation is still below 5%. " - Arthur Lee - Certified Passive House Designer.