– Hitachi's PAM Room Air Conditioner registered as an Essential Historical Material for Science and Technology

Hitachi’s PAM Inverter Room Air Conditioner (RAS-501HX2), originally released by Hitachi in 1997, has been registered as an Essential Historical Material for Science and Technology by Japan’s National Museum of Nature and Science.

Founded in 1877, the National Museum of Nature and Science boasts one of the richest histories of any museum in Japan. It is Japan’s only nationally administered comprehensive science museum, and is a central institute for research in natural history and history of science and technology.

The PAM inverter room air conditioner was an epoch-making product in air conditioning technology history that made it possible to achieve both high power and low energy consumption. Its high power heating capabilities won it acclaim even in cold climate regions, where the heating function of conventional inverter air conditioners had been considered insufficient. It also contributed to the wide-spread use of heat pump heating. These technologies made energy efficiency and high heating ability a reality, making it recognized as a heating appliance in cold regions, where inverter models had been considered insufficient capacity at the time.

The PAM-controlled inverter has been applied to refrigerators and other household appliances, and it is valuable for its great improvement of energy saving, efficiency, and other factors. Played a notable role in improving people’s way of life and creating new ways of living.

Thanks to the National Museum of Nature and Science in Japan for this recognition and Congratulations to those who were involved in development at that time!