https://rw.songzac.com/
Imashini ikoresha umuyaga ushyushye ya bisi, sisitemu yo gucunga ubushyuhe, Hybrid Hvac - SONGZ
SONGZ yashinzwe mu 1998, ni ikigo gikomeye cy’imigabane cyihariye mu bushakashatsi, iterambere, inganda, no kugurisha sisitemu z’umwuka ukonjesha imodoka.