Im curious is there any advantage to a non-inverter mini-split without its control? What makes the mini-split any more efficient than say a window unit? Larger coil obviously helps, but what advantage does the multi-speed fan have if the compressor doesn't ramp up and down with it?
In Heat-pump mode it seems to me you would basically want the outdoor fan to run full speed always(beside defrost) to obtain the max amount of heat from the air, and vary the indoor pump speed to maintain adequate head pressure and floor temperature. Actually if that's the case, building your own controls shouldn't be to hard if you can figure out a decent demand defrost algorithm.
Best of luck,
Adam
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