The installations described here concern new systems chosen according to the building, its uses, and performance objectives: wall-mounted heat pumps , wall-mounted air conditioners , central heat pumps , central air conditioners , multi-zone systems , air-to-water systems , PTAC/VTAC solutions, as well as ventilation (air exchangers, humidity control, fresh air supply). These configurations apply to houses , multi-unit residential buildings , commercial spaces , and mixed-use buildings , linking the selection to measurable criteria: • building envelope characteristics, volumes, and interior layout • occupancy profiles, internal loads, and operating hours • thermal loads and dehumidification/air renewal requirements • energy efficiency objectives and operational stability. The approach aims to avoid oversizing, preserve actual comfort, and ensure operation consistent with the site's realities.