I have had a couple of quotes for a Ductless Mitsubishi AC/heatpump and was wondering about the differences in placement of the compressor. The building is a 1000 Square foot brick structure with a flat roof. One contractor wants to put the compressor standing upright on the flat roof. The other suggests it would be better to hang the compressor off the building or put it at ground level, very near to spot where the outlet will be, saying that the compressor will last longer if it is out of the elements and efficiency will be better if the coolant and heat lines are kept very short.
Also, will the heat pump efficiency be improved if it is mounted in an area that gets less wind than on the roof?. The wall it would go on faces South if that is a factor?