The Mitsubishi models MSZ-SF25VE3, MSZ-SF35VE3, MSZ-SF42VE3, and MSZ-SF50VE3 are air-to-air air conditioners with a closed refrigeration circuit. These systems use R410A refrigerant that circulates between an indoor unit (wall-mounted) and an outdoor unit, without using water as a heat transfer medium.
The operation relies on direct thermal exchange between the indoor air and the outdoor air. The indoor unit absorbs heat from the ambient air and releases it through the outdoor unit in cooling mode. In heating mode, the process reverses: heat is extracted from the outdoor air and returned indoors. The R410A refrigerant circulates in a closed circuit through a compressor, a condenser, an evaporator, and an expansion valve.
These air conditioners offer four operating modes: cooling, heating, dehumidification, and simple ventilation. The refrigerant charge capacities vary by model (from 0.70 to 1.55 kg), tailored to the cooling power of each unit (2500W to 5000W).
Unlike air-to-water systems that require water circulation and a dedicated hydraulic circuit, these air-to-air air conditioners are simpler to install and maintain, with no risk of water leaks. They are perfectly suited for residential and light commercial applications, providing optimal energy efficiency while remaining discreet due to their compact wall-mounted design.