The work described here relates exclusively to new systems and covers, depending on the context: 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 configurations apply to houses , multi-unit residential buildings , commercial spaces , and mixed-use buildings , based on a selection process that considers the building's characteristics and operation: • building characteristics (envelope, volumes, layout, ductwork options) • usage profiles (occupancy, schedules, priority zones, fresh air requirements) • thermal loads and operational objectives (energy efficiency, stability, peak control) in order to align sizing, architecture, and settings.