Air-water heat pump with enclosure, yes or no

In my opinion, it needs to be clarified why the development plan allegedly requires an enclosure. That can only be related to the noise emission. Then you simply buy a suitably quiet device that does not need the enclosure.

Such an air heat pump has a huge air throughput that should not be obstructed. Any enclosure is a compromise with certain efficiency losses. During the warranty period, I would only use enclosures offered or approved by the pump manufacturer.

If you have space, then work without a split unit.