the ductless split system that was in the manual richard attached require a permanent mounting. many years ago i used to define, and sell the inverter motor control microprocessors that were used in them for a long time. inverter motor control allows them to need much less power. they were designed originally for the japanese market where 100amp service was common and accomodations were smaller than here in the usa.
the indoor unit is basically an air handler with controls and no duct. they are now commonly used in large commercial buildings and churches where people need to be in a single office and not heat a large building to be ini it.
they are awesomely good units. Mitsubishi and Sanyo were the pioneers in developing them and i went to their facilities in japan many many times. in the late 80's early 90's.
the inside unit mounts on the wall, but has electrical and freon lines that run to the ouside compressor unit.
i struggle to see how they would work as well as our roof mounted units.
more than you wanted to hear i would guess.
later
tom
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