Dürfeld has a team trained in the installation requirements for Passive House certified Optiwin windows. For your project, Dürfeld will supply you with the information and assistance required for self installation or we can supply an employee to aid with installation if needed.
Over the last several years Austrian based company, Fresinger (manufacturer of Optiwin) has invested considerable time and resources to develop a wood based system which reaches Passive House standards. The goal was to combine the sustainable and aesthetic qualities of wood with the high energy performance
ratings generally associated with petrochemical based window materials like vinyl and fiberglass. Freisinger recently has made their products available in North America and has a long term goal of setting up local production sites to reduce the costs, both direct and environmental, of transportation from Europe.
Due to a highly competitive market for energy rated windows in Europe, these windows can be purchased at a price comparable to local high quality fiberglass and vinyl North American windows.
Comparison for Overall Conduction Values of Different Window Types (Glazing and Frame)
|Window Type||U-Value (W/m2K)||>R-Value (BTU/ft2Fh)|
|Canadian Standards*||Energy Star||1.8||3.2|
|Double Pane (Standard)||3.1||1.8|
|Single Pane (Standard)||6.2||0.9|
*Office of Energy of Efficiency Canada (http://oee.nrcan.gc.ca/)