Thermally enhanced multi-component window

A window comprising:

• an insulated glass unit including:
• a first glass pane;
• and
• a second glass pane spaced from the first glass pane, the first glass pane and the second glass pane defining a pocket therebetween, wherein a central plane extends through the pocket and is spaced equal distances from the first glass pane and the second glass pane;
• a frame supporting the insulated glass unit, the frame including a first material, wherein the first material is visible on a first side of the window;
• cladding connected to the frame, the cladding including a second material, wherein the second material is visible on a second side of the window, wherein the frame defines a cavity that extends between the first side and the second side and is configured to inhibit moisture from the first side contacting the second material;
• a first thermal cavity defined by the frame intermediate the first side and the second side and circumscribing the insulated glass unit, wherein the first thermal cavity is aligned with the pocket such that the central plane extends through the first thermal cavity;
• and
• an insulating material within the first thermal cavity;
• a sash frame circumscribing the insulated glass unit and positioned in the frame;
• and
• a second thermal cavity defined by the sash frame intermediate the first side and the second side, wherein the second thermal cavity is aligned with the pocket such that the central plane extends through the second thermal cavity, and wherein the first thermal cavity, the second thermal cavity, and the pocket define a continuous thermal break extending through the window.