The installations described relate exclusively to new systems , including 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 management , fresh air supply ). These solutions can be integrated into houses as well as multi-unit residential buildings , commercial spaces and mixed-use buildings , according to a selection logic based on: • building characteristics (envelope, volumes, layout, duct constraints) • usage profiles (occupancy, schedules, critical zones, fresh air requirements) • thermal loads and operating objectives (energy efficiency, stability, peak control) in order to align the sizing and configuration with the actual use.