Abstract: A rooftop air conditioning assembly (60) for a building having a rooftop and an internal volume. The assembly includes a chassis (20), a plurality of outdoor sections (58), one indoor section (56) and refrigerant tubes (40). The chassis (20) is adapted for mounting adjacent one or more rooftop openings. The plurality of outdoor sections (58) are mounted on the chassis (20), with each of the outdoor sections (58) having at least one air inlet in fluid communication with atmosphere and at least one air outlet in fluid communication with atmosphere. The one indoor section (56) is mounted on the chassis (20), and has an air outlet in fluid communication with the internal volume via the one or more rooftop openings and an air inlet in fluid communication with the internal volume via the one or more rooftop openings. The refrigerant tubes (40) connect the outdoor sections (58) to the indoor section (56).