The end result: windows that keep heat out in summer and heat in during the cold months, and radiators that pump heat to the building's interior without bleeding so much of it into the outside air.

Considering the cold climate in Hokkaido, it didn't seem to be the most appropriate solution to make a wide open interior space as outdoors, yet, keeping the house shape on the exterior.

Interior of the pump placed in the application of cold or wind areas, as well as the process has the special requirements of the occasion.