Optimal Windows produce timber windows and doors suitable for certified Passive Houses in New Zealand.
These wooden windows must meet the strict air tightness and thermal performance criteria set out in the Passive House Standard which is arguably the worlds most rigorous quality assurance in energy efficient buildings.
Our Passive House windows are manufactured right here in New Zealand offering more flexible design and minimal lead times with excellent after sales service from the people that make the windows.
Optimal Windows are available in both IV68mm and IV90mm double glazed and triple glazed windows for Passive House projects.
We also offer a timber/aluminium composite range with very similar performance.
Performance for Optimal wooden windows:
IV68mm: Uw 1.34 (R 0.75)
IV90mm: Uw 0.78 (R 1.28)
U value and fRSI values for individual profiles and components, as well as a performance calculator are available on request.
