HVAC apparatus, method, and system

An air handler unit housing for an HVAC system for providing conditioned air to a room, the air handler unit housing, when assembled, defining an interior space having first and second opposite narrow sides, first and second opposite wide sides, and first and second opposite ends, the air handler unit housing comprising:

• a. a plurality of structural panels comprising a first panel across the first narrow side, the first panel comprises a one-piece L-shape corner wrap around wall having a first section across the first narrow side of the housing and a wrap-around section extending across part of the first wide side of the housing, a second panel which abuts the wrap-around section of the first panel and at least substantially covers a remainder of the first wide side of the housing not covered by the L-shape corner wrap around wall, third and fourth interchangeable panels across the opposite ends of the housing, a single support assembled between the third and fourth panels, the single support located at the first and second opposite ends of the housing at the second narrow side in a corner opposite the one-piece L-shaped corner wrap around panel, all to create a partial enclosure with the second narrow side and the second wide side substantially open;
• b. openings in the plurality of structural panels that are alignable to assemble and structurally secure adjacent parts of the plurality of structural panels with the same fasteners;
• and
• c. at least one removable access panel sized to cover at least a portion of one of the substantially open second narrow side or the substantially open second wide side of the housing;
• d. a brace across at least one narrow or wide side intermediate the opposite ends of the housing;
• e. thereby allowing an air handler housing that:
• i. is installable in different orientations relative to vertical or horizontal and relative to a mounting location while maintaining accessibility through the one or more access panels regardless of orientation;
• ii. uses minimal parts for structure;
• and
• iii. uses the same fastening hardware for at least most of the structural panels.