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We plan to build a detached house with a heated floor powered by a PAC air / water (we live in the 84). We would like to know if, by exposing the outside group to the south, and not to the north, our PAC will be easier to operate (easier to recover calories on a "hot" air) during periods of extreme cold?

A heat pump supplying a floor heating is a very good heating solution.
The outdoor unit must be easily exccessible, as far as possible away from strong drafts taking into account the fact of its sound level. Exposure matters little, especially since you do not live in a cold area. The air temperature itself is not very affected by solar radiation, although it is obvious that a sunny position will always be preferable to a position north of the house.
Avoid confining the cap in a shed or garage, as this may cause refrigeration.

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