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A fenestration assembly comprising a sliding glass assembly that slides between a fully closed position and a fully open position in which the sliding glass assembly is received into a pocket of the fenestration assembly. The pocket is covered on at least one side with insulation. The fenestration a

A fenestration assembly comprising a sliding glass assembly that slides between a fully closed position and a fully open position in which the sliding glass assembly is received into a pocket of the fenestration assembly. The pocket is covered on at least one side with insulation. The fenestration assembly may have two sliding glass assemblies. The fenestration assembly may be used in an energy efficient building system.

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1. An energy efficient fenestration assembly for enclosing an opening in a building wall and configured to overlay a conventional window the fenestration assembly comprising: a frame having at least four edges surrounding first and second sides to be partially covered by building material, the frame

1. An energy efficient fenestration assembly for enclosing an opening in a building wall and configured to overlay a conventional window the fenestration assembly comprising: a frame having at least four edges surrounding first and second sides to be partially covered by building material, the frame defining:an opening from the first side to the second side; anda first pocket section next to the opening and sized at least equally to the opening,the frame comprising:an insulating mullion pocket between the opening and the first pocket section; andthree respective insulating edge pockets within three of the at least four edges of the frame, the three of the at least four edges surrounding the opening;an insulating section between the first pocket section and one of the first or second sides of the frame; anda first sliding insulating glazing unit supported on a bottom edge by roller carts moveable within a raceway of the frame, the first sliding insulating glazing unit capable of sealing the opening and moveable between:a fully-closed position in which the first sliding insulating glazing unit is located substantially within the opening and seals the opening; anda fully-open position in which the first sliding insulating glazing unit is located substantially within the first pocket section of the frame,wherein the first sliding insulating glazing unit comprises two or more glass sheets that are spaced apart and sealed at perimeter edges of the two glass sheets and features one or more low emissivity coatings facing at least one glazing cavity between the glass sheets and where the center-of-glass provides more thermal resistance than the perimeter edges, andwherein in the fully-closed position, the perimeter edges of the first sliding insulating glazing unit are located within the three insulating edge pockets and the insulating mullion pocket of the frame. 2. The energy efficient fenestration assembly of claim 1, wherein the frame further comprises a second pocket section next to the opening and sized at least equally to the opening and wherein the fenestration assembly further comprises a second sliding insulating glazing unit within the frame capable of sealing the opening and moveable between: a fully-closed position in which the second sliding insulating glazing unit is located substantially within the opening and seals the opening; anda fully-open position in which the second sliding insulating glazing unit is located substantially within the second pocket section of the frame, andwherein perimeter edges of the second sliding insulating glazing unit are located within the three insulating edge pockets of the frame and the insulating mullion pocket of the frame. 3. The energy efficient fenestration assembly of claim 2, further comprising: a blind within the opening of the frame located between the first sliding insulating glazing unit and the second insulating glazing unit; andan actuator for controlling the position of the blind. 4. The energy efficient fenestration assembly of claim 2, wherein one of the first or second sides of the frame is an exterior side and the other of the first or second sides of the frame is an interior side, wherein each of the first and second sliding insulating glazing units have glass surfaces that are numbered sequentially starting from the exterior side and wherein glass surface three has a solar gain, low emissivity coating, and wherein glass surface six has a solar control, low emissivity coating. 5. The energy efficient fenestration assembly of claim 1, wherein the first sliding insulating glazing unit comprises a vacuum insulating glass unit. 6. The energy efficient fenestration assembly of claim 1, further comprising a second insulating section located on the other side of the first pocket section from the insulating section, wherein the insulating section comprises a stressed skin panel comprising an insulating core and at least one structural skin. 7. The energy efficient fenestration assembly of claim 1, further comprising a first compressible seal located on the frame or on the first sliding insulating glazing unit and sealing the first sliding insulating glazing unit to the frame. 8. An energy efficient fenestration assembly installation over an opening in a building wall, the fenestration assembly installation comprising: a conventional window installed within the opening in the building wall;an energy efficient fenestration assembly arranged to overlap the conventional window, the energy efficient fenestration assembly comprising:a frame having at least four edges surrounding first and second sides to be partially covered by building material, the frame defining:an opening from the first side to the second side, the opening overlapping the conventional window installed within the opening in the building wall; anda first pocket section next to the opening and sized at least equally to the opening, the first pocket section overlapping the building wall,the frame comprising:an insulating mullion pocket between the opening and the first pocket section; andthree respective insulating edge pockets within three of the at least four edges of the frame the three of the at least four edges surrounding the opening;an insulating section between the first pocket section and one of the first or second sides of the frame; anda first sliding insulating glazing unit supported on a bottom edge by roller carts moveable within a raceway of the frame, the first sliding insulating glazing unit capable of sealing the opening and moveable between:a fully-closed position in which the first sliding insulating glazing unit is located substantially within the opening and seals the opening; anda fully-open position in which the first sliding insulating glazing unit is located substantially within the first pocket section of the frame,wherein the first sliding insulating glazing unit comprises two or more glass sheets that are spaced apart and sealed at perimeter edges of glass sheets and features one or more low emissivity coatings facing at least one glazing cavity between the glass sheets and where the center-of-glass provides more thermal resistance than the perimeter edges, andwherein in the fully-closed position, the perimeter edges of the first sliding insulating glazing unit are located within the three insulating edge pockets and the insulating mullion pocket of the frame. 9. The energy efficient fenestration assembly installation of claim 8, wherein the first sliding insulating glazing unit comprises a vacuum insulating glass unit. 10. The energy efficient fenestration assembly installation of claim 8, wherein the energy efficient fenestration assembly further comprises a second insulating section located on the other side of the first pocket section from the insulating section, wherein the insulating section comprises a stressed skin panel comprising an insulating core and at least one structural skin. 11. The energy efficient fenestration assembly installation of claim 8, wherein the energy efficient fenestration assembly further comprises a first compressible seal located on the frame or on the first sliding insulating glazing unit and sealing the first sliding insulating glazing unit to the frame. 12. The energy efficient fenestration assembly installation of claim 8, wherein the edges of the vacuum insulating glass unit are located about two inches within the three respective insulating edge pockets and the insulating mullion pocket when in the fully closed position. 13. The energy efficient fenestration assembly installation of claim 8, further comprising insulation surrounding exterior edges of the three of the at least four edges of the frame having the insulating edge pockets and the insulating mullion pocket. 14. The energy efficient fenestration assembly installation of claim 13, wherein the insulation surrounding exterior edges of the frame hides the frame from view so that only the glass of the first sliding insulating glazing unit is visible to an observer looking out the opening. 15. The energy efficient fenestration assembly installation of claim 8, wherein perimeter edges of the sliding insulating glazing unit are sealed by compressible rubber seals. 16. The energy efficient fenestration assembly installation of claim 8, wherein the insulating section comprises a stressed skin panel. 17. The energy efficient fenestration assembly installation of claim 8, further comprising a vacuum insulating panel between the first pocket section and the building wall. 18. The energy efficient fenestration assembly installation of claim 8, wherein the energy efficient fenestration assembly further comprises: a blind located between the fenestration assembly and the conventional window; andan actuator for controlling the position of the blind. 19. The energy efficient fenestration assembly installation of claim 18, wherein the blind is located on an exterior of the conventional window and dynamically controls solar heat. 20. The energy efficient fenestration assembly installation of claim 18, wherein the blind incorporates a low-e coating on one or more surfaces of the blind. 21. The energy efficient fenestration assembly installation of claim 18, wherein one or both glazing surfaces facing the blind feature a low-emissivity coating. 22. The energy efficient fenestration assembly installation of claim 8, wherein the operation of the interior fenestration assembly or conventional window is motorized. 23. The energy efficient fenestration assembly installation of claim 8, wherein the conventional window is a single glazed window. 24. The energy efficient fenestration assembly installation of claim 8, wherein the combined center-of glass performance of the fenestration assembly and the conventional window is about R-14. 25. The energy efficient fenestration assembly installation of claim 8, further comprising a slim line profile adhered to at least one perimeter edges of the insulating glass unit using a sealant material. 26. The energy efficient fenestration assembly installation of claim 8 wherein the building wall comprises additional insulation so that an outer surface of the additional insulation of the wall assembly is in line with an outer surface of the fenestration assembly.