The installations described here relate exclusively to new systems : wall-mounted heat pumps , wall-mounted air conditioners , central heat pumps , central air conditioners , multi-zone systems , air-to-water systems , PTAC/VTAC , as well as ventilation ( air exchangers , humidity control , fresh air supply ). These solutions are applicable to houses , multi-unit residential buildings, commercial spaces , and mixed-use buildings , according to a technical selection logic based on: • building characteristics (envelope, volumes, layout, ductwork possibilities) • usage profiles (occupancy, schedules, priority zones, fresh air requirements) • thermal loads and operating objectives (energy efficiency, stability, peak load control), in order to align sizing, architecture, and settings with actual usage.