Technical room boundary construction, air source heat pump suction

Thank you for the feedback..

the last 3 m from the TE are behind his garage. Thus from his point of view

Almost yes with the authority :-9

A split unit will be the best choice in this case. The refrigerant line is available in lengths of 10m, 20m, and 30m coils. Specifically, you may have to make compromises regarding the choice of manufacturers and the optimal efficiency. A longer refrigerant line or a different unit can quickly cost 5-10% in efficiency. However, if there is no other option, this could be the lesser evil.