A high-performance window from Colorado-based Zola Windows is the first to be certified by both the Passivhaus Institut in Germany and the Passive House Institute U.S., according to Energy Design Update.
The Zola No Compromise window is available with both three- and four-pane glazing and R-values up to 15. Fixed windows can be ordered in sizes up to 10 feet high and 8 feet wide; tilt-and-turn windows come in sizes up to 5 feet wide and 9 feet high.
Window frames are made of wood, with exterior surfaces protected by powder-coated aluminum cladding. Integrated insect screens also are available.
Zola, based in Steamboat Springs, Colorado, manufactures the windows in Poland.
Company Vice President Florian Speier said that in a project with a mix of window types, including tilt-and-turn, fixed and an entrance door, windows would probably cost about $60 to $80 per square foot. More complicated windows incorporating muntin bars or arches would be more expensive.
Speier said the production lead time is nine weeks. Shipping is an additional three weeks to the east coast and up to six weeks to the west coast.
For more information on Zola windows, see New Green Building Products — June 2013.