Passivhaus Windows, Made in the U.S.A.

Casagrande will reportedly begin production of its PHI-certified Synergist model, a wood casement window, this summer. The Synergist window is certified with a whole-window U-value of 0.139 (R-value of 7.2).

Wooden Window expects its CaliPassiv line (which currently includes one fixed and one operable wooden window, both with aluminum cladding) to start rolling off assembly lines in the next few months. Both models boast a whole-window U-value of 0.137 (an R-value of 7.3).