Uploaded July 2026 | Updated September 2026, 26 minutes ago

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Ductless? Multi-Zone? Heat Pump? A modern, inverter-drive variable-speed/variable refrigerant flow mini split? Or a mid to late 1980's Carrier "Multiplex" system using a full-sized "Round One" outdoor unit along with solenoid valves and relay logic based controls to drive up to three indoor coils.

(Made using literature and component pictures I found)

"Split Coolers" Popular Science July 1988, Page 76-77
books.google.com/books?id=R4zUHMZQudoC&lpg=PP1&pg=PA76#v=twopage&q&f=false