Only 3 NA companies make the high-performance windows needed for Passive House.
- Serious Windows
Here are some numbers on sizing:
- Tilt and turn windows work best at about 3 to 4ft wide.
- Triple pane casements should not be wider than 34" or the hinge hardware becomes inadequate
- Casement dimensions are max about 34"x72".
- Awning windows are good up to 4'x4' sizes.
- Pricing is by perimeter, except the customer base prefers 'united length'. At a certain size, windows jump in price due to the need to thicken the glass, which is determined by wind pressures and CSA codes. This size is 95 united inches (outside dim of windows, length plus width). Above 95 Ui, glass must be 4mm thick, rather the 3.
- Thermotech recently began offering a triple pane glass with low -e, argon, and now low-iron glass called their 322 Gain Plus. The low iron improves SHGC, though drops R value slightly. Krypton fill adds about $20 to $30 per SF to window costs (!).
- Nice window hardware is by Roto, Segania, G. U.
- Energy Rating (ER) rating is a Canadian rating system for windows that takes solar heat gains into account as well as R-value. Thermotech windows perform very well in this rating system, in which solar gains over 200 days in the year are averaged.
- Here is a window discussion in GreenBuildingAdvisory.com: http://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/14850/serious-windows-vs-thermotech-fibertec-inline