The installations described here concern new systems , selected and adapted to the specific characteristics of the building and its occupancy profile, whether it be houses , multi-unit residential buildings , commercial spaces , or mixed-use buildings . Depending on the constraints and objectives, we integrate wall-mounted heat pumps , wall-mounted air conditioners , central heat pumps , central air conditioners , multi-zone systems , air-to-water systems , as well as PTAC/VTAC and ventilation solutions (air exchangers, humidity control, fresh air supply), linking the decision to measurable parameters: • characteristics of the building envelope and the volumes to be treated • usage profiles and occupancy schedules • thermal loads and dehumidification requirements • energy efficiency and operational stability objectives. The system architecture aims for sustained performance, without oversizing, and integration compatible with the actual operation of the site.