This air conditioning unit has earned the highest A+++ ranking under the European energy saving standard (SEER), even in a compact casing. It has the following features for harmonizing with residential spaces: (1) The width of the main unit is matched to common door sizes in French cities, where units are often mounted above doors. (2) The main unit shape narrows toward the bottom to reduce the overall impression of size where mounted. (3) The simple details eliminates seams between parts and concave or convex shapes as much as possible.(4) Unified design as a series for different unit size.