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A heat exchange apparatus is mountable in an exterior building wall structure having an exterior wall panel and interior wall panel. The apparatus includes a frame, a pivotal panel member and a cover door. The frame is attached to the wall structure proximate an opening in the exterior wall panel. T

A heat exchange apparatus is mountable in an exterior building wall structure having an exterior wall panel and interior wall panel. The apparatus includes a frame, a pivotal panel member and a cover door. The frame is attached to the wall structure proximate an opening in the exterior wall panel. The cover is detachably attached to the frame and the panel member pivots from a closed to an open position. The panel member is hingedly attached to the frame. A heat exchange system, such as an air conditioning or a heat pump system, or both, is mounted on the panel member so that when the cover door is removed, the panel member may be swung open, providing easy access to the heat exchange system for maintenance. The panel member, when in the closed position, divides the interior of the housing into interior and exterior air flow sections. The cover door has an air intake and an air discharge communicating with the exterior air flow section, and the interior wall panel of the building wall has an air intake and an air discharge communicating with the interior air flow section.

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1. A heat exchange apparatus mountable within an opening in a wall structure of a building for transferring heat between the interior of the building and the environment, said wall structure having an interior wall panel and an exterior wall panel, the interior wall panel having an interior air inta

1. A heat exchange apparatus mountable within an opening in a wall structure of a building for transferring heat between the interior of the building and the environment, said wall structure having an interior wall panel and an exterior wall panel, the interior wall panel having an interior air intake and an interior air discharge means communicating with the interior of the building, the apparatus comprising: a housing defining an enclosure and having a frame, a pivotal mounting means, a panel member and an exterior cover door, the frame member being attachable to the wall structure, the panel member having an interior surface and an exterior surface and being pivotally mounted by the pivotal mounting means to the frame and being pivotal between a closed position and an open position, the panel member dividing the enclosure into an interior air space portion and an exterior air space portion, the interior air space portion communicating with the interior of the building through the interior air intake and the interior air discharge means, the cover door being detachably attached to the frame so that the panel member is accessible and is permitted to pivot to the open position, the cover door including an exterior air intake and an exterior air discharge means for permitting exterior air to flow within the exterior air space; and heat transfer selectively mounted on the exterior and interior surfaces of the panel member so that heat is selectively transferred between the interior air space portion and the exterior air space portion and such that when the panel member is pivoted to the open position, the heat transfer means is accessible from the exterior of the building for maintenance. 2. The apparatus of claim 1 wherein the interior wall panel and the exterior wall panel of the wall structure are mounted on substantially vertical spaced-apart stud members and the opening within the wall structure is between two spaced-apart stud members and wherein the frame has first and second spaced-apart substantially vertical side wall members which are attachable to the first and second stud members positioning the housing at least partially within the opening, said first and second side wall members connected to each other by at least one connecting member. 3. The apparatus of claim 1 wherein the pivotal mounting means is a hinge pivotally attaching an edge of the panel member to the frame member. 4. The apparatus of claim 1 wherein the interior air intake is proximate a ceiling of the interior of the building and the interior air discharge is proximate a floor of the interior of the building so that air proximate the ceiling of the interior of the building is initially cooled by the heat transfer means. 5. The apparatus of claim 4 wherein the air intake includes a filter accessible from the exterior of the building when the panel member is in an open position. 6. The apparatus of claim 1 wherein the heat transfer means includes a refrigeration system wherein a gaseous refrigerant is compressed to remove heat therefrom and expanded to absorb heat, including an exterior coil means mounted on the panel member in the exterior air space portion and an interior coil means mounted in the interior air space portion, and including a compressor mounted on the panel member and fluidly connected with the exterior and interior coils, and including valve means for changing the refrigerant gas from a high pressure state to a low pressure state, and means for reversing the flow of refrigerant gas so that the refrigerant system can transfer heat from the interior of the building to the exterior or transfer heat from the exterior to the interior of the building. 7. The apparatus of claim 6 wherein the interior coil is pivotally mounted on the panel member at a lower end and slightly inclined toward the interior wall panel of the building, abutting said interior wall panel at an upper end and positioned below the interior air intake. 8. The apparatus of claim 6 and further including an electric resistance heater mounted on the panel member and including means for turning the electric heater on at a predetermined temperature when the refrigeration system is in the heat pump mode. 9. The apparatus of claim 6 wherein the means for circulating air within the interior air space is a blower fan mounted on the panel member and the panel member includes a plate member extending therefrom toward the interior wall of the building, abutting said wall of the building when the panel member is in the closed position. 10. A heat exchange apparatus mountable within an opening in a wall structure of a building for transferring heat between the interior of the building and the environment, said wall structure having an interior wall panel and an exterior wall panel, and the building having a ceiling defining an upper end of the interior wall panel and a floor defining a lower end of the interior wall panel, the apparatus comprising: a housing defining an enclosure and having a frame for attachment to the wall structure and an exterior cover door detachably attachable to the frame from the exterior of the building, the cover door having an air intake and discharge means; means for dividing the enclosure of the housing into an interior air space portion and an exterior air space portion, mounted on the housing frame and being movable between a closed position within the housing and an open position substantially outside the housing; an interior air intake disposed in the interior wall panel proximate the ceiling for permitting air to flow into the interior air space portion of the enclosure from the interior of the building; an interior air discharge disposed within the interior wall panel proximate the floor for permitting air to flow from the interior air space portion into the interior of the building; and heat transfer means selectively mounted on the means for dividing the enclosure so that heat is selectively transferred between the interior air space portion and the exterior air space portion and such that when the means for dividing is moved to the open position, the heat transfer means is accessible for maintenance. 11. The apparatus of claim 10 wherein the housing further includes a hinge means and wherein the means for separating the enclosure is a panel member pivotally mounted by the hinge means to the frame and being pivotal between a closed position and an open position so that the heat transfer means is accessible from the exterior of the building for maintenance when the cover door is detached from the frame and the panel member is pivoted to the open position.