Daikin considers the Quaternity its premium all-in-one mini-split system, providing high-efficiency heating, cooling, dehumidification, and air purification, all in one system. Integrated with an inverter variable-speed compressor, systems deliver up to 26.1 SEER and 15.8 HSPF. They can also deliver high heating capacity at low ambient temperatures down to minus 4°F. According to the company, systems operate at whisper quiet sound levels as low as 26 dBA for indoor units and 46 dBA for outdoor units. Utilizing intelligent indoor heat exchanger technology, dehumidification can be achieved by maintaining room temperature and controlling humidity to a relative setting.
Source: ACHR News (a part of news report)