A window assembly, comprising: an electro-optic element, comprising: a first substantially transparent substrate defining first and second surfaces (26, 30), wherein the second surface comprises a first electrically conductive layer; a second substantially transparent substrate defining third and fourth surfaces (42, 46), wherein the third surface comprises a second electrically conductive layer and a cavity is defined between the first substantially transparent substrate and second substantially transparent substrates; and an electro-optic medium disposed in the cavity, the electro-optic medium being variably transmissive such that the electro-optic element is operable between substantially clear and darkened states, wherein the window assembly further comprises: a first pane positioned proximate the first surface of the electro-optic element; an infrared reflective film positioned on a surface of the window assembly on an outward side of the electro-optic element; and a third pane positioned proximate to the fourth surface of the electro-optic element characterized in that the first pane is spaced apart from the electro-optic element by a first gap and the third pane is separated from the electro-optic element by a third interpane gap, wherein the interpane gaps (160a, 160c) separate the panes (160, 168) from the electro-optic element by an air space. a first substantially transparent substrate defining first and second surfaces (26, 30), wherein the second surface comprises a first electrically conductive layer; a second substantially transparent substrate defining third and fourth surfaces (42, 46), wherein the third surface comprises a second electrically conductive layer and a cavity is defined between the first substantially transparent substrate and second substantially transparent substrates; and an electro-optic medium disposed in the cavity, the electro-optic medium being variably transmissive such that the electro-optic element is operable between substantially clear and darkened states, wherein the window assembly further comprises: a first pane positioned proximate the first surface of the electro-optic element; an infrared reflective film positioned on a surface of the window assembly on an outward side of the electro-optic element; and a third pane positioned proximate to the fourth surface of the electro-optic element characterized in that the first pane is spaced apart from the electro-optic element by a first gap and the third pane is separated from the electro-optic element by a third interpane gap, wherein the interpane gaps (160a, 160c) separate the panes (160, 168) from the electro-optic element by an air space. a first pane positioned proximate the first surface of the electro-optic element; an infrared reflective film positioned on a surface of the window assembly on an outward side of the electro-optic element; and a third pane positioned proximate to the fourth surface of the electro-optic element characterized in that the first pane is spaced apart from the electro-optic element by a first gap and the third pane is separated from the electro-optic element by a third interpane gap, wherein the interpane gaps (160a, 160c) separate the panes (160, 168) from the electro-optic element by an air space.