Windows and Doors

Solid wood triple glazed windows and doors.

Ecocor - Window Systems


We import the highest quality European windows. Our Partner companies CDM Drewno and M SORA offer fantastic window and door solutions. If you can dream it, they can make it. We do not use plastic windows.......ever. All of our windows are solid wood. The performance is exceptional. Most imporantly, they are beautiful and sustainable.

Glass R-11.3 

Whole window R value  R 6 -8 



Ecocor is Proud to Represent Leading European Window Manufacturers

High Performance Homes require high performance windows and exterior doors. We have sought out the products with the best quality, best performing and best value. We would be happy to review the options with you.

Passive House windows and doors are different from typical American products. The exterior doors seal securely against air and water infiltration, and triple-pane glass panels perform even better than the well-insulated frames, so we usually recommend all exterior doors to be glass.

As for windows, double-hung units are too leaky for a Passive House. We use European tilt/turn windows, which operate like an inswing casement window; with the flip of the handle, they hinge at the bottom and open at the top, like a hopper window. This style is capable of sealing tight against air infiltration. We also use large fixed windows where appropriate. We have developed our own installation systems to ensure that the windows and doors perform at the absolute highest levels.

The International Passive House Institute has certified our assemblies using MSora’s Natura Optimo and Also CDM Drewno's 92mm Hardline series window's. Thermal performance of the window is: Ug=0.5 W/m²K, Uw=0.74 W/m²K (total window performance of 0.130 Btu/hr ft² °F, ≈ R 7.67). Using Ecocor’s unique window installation details, the certified, installed values of our windows is Uwi=0.85 W/m²K (0.15 Btu/hr ft² °F), ≈ R 6.67.

We're proud to announce that we are the first certified Passive House component manufacturer outside of Europe

Check out our Passive House Components. Our Panelized Construction approach to passive house building is perfect for all high performance building applications.