Japanese heating system manufacturer Daikin has unveiled a new series of residential air-to-air heat pumps that it says are particularly suitable for highly insulated, airtight homes, where heating and cooling loads can remain low for extended periods once the desired indoor temperature has been reached.

The systems use R32 as the refrigerant, which has a global warming potential (GWP) of 675, and rely on a “small-capacity, high-efficiency compressor” that can reportedly maintain efficient operation under low-load conditions, reducing the energy losses associated with frequent compressor cycling.

Initially launched in the Japanese market, the Ururu Sarara X heat pump line comprises nine models for rooms ranging from six to 26 tatami mats, a Japanese unit of floor area, corresponding to approximately 10 m² to 43 m². Five models operate with a single-phase 100 V power supply and five are available with a 200 V connection, with the 4.0 kW capacity class offered in both configurations.

The manufacturer said the new compressor is particularly suited for spaces where indoor temperatures are less affected by outdoor conditions and the units consequently spend longer periods operating at low output. According to Daikin, the technology can also contribute to meeting the energy-performance requirements of Japan’s GX-oriented and zero-energy home (ZEH) standards.

The heat pumps also feature a new outdoor-temperature-dependent “Heat Boost Control.” The function is activated when outdoor temperatures fall to 2 C or below and increases both heating capacity and airflow.

Daikin said the technology can reduce the time required to reach the set temperature by around 20% compared with its previous-generation system.

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