Where you put the indoor sensors makes a lot of difference how the unit will act. With air hx units, the ambient sensor is in the air path on the suction side of the air handler, and the pipe sensor is tied to the refrigerant pipe between the compressor discharge and the air hx. I would leave the pipe sensor in the same spot, but placement of the ambient sensor really depends on your intentions. Constant supply water temp, constant return water temp, constant slab temp, etc. There are many possibilities, and I myself would try a few different schemes before deciding where to permanently mount the thing.
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