In Japan, the outside temperature varies from 0°C to 35°C throughout the year.
In contrast, the underground temperature is 10-17°C throughout the year, which is more stable than the outside temperature.
A geothermal heat utilization system recovers and utilizes this stable geothermal heat.
A heat pump type heat source machine is used as a device for utilizing underground heat.
Compared to heating with kerosene, CO2 emissions can be greatly reduced.
This method has a high initial cost, but greatly reduces the running cost.