The German technology group Bosch is working on a multibillion-euro deal for its heating and climate technology division which the company says is the largest in its history. The group plans to acquire the global business for heating, ventilation and air conditioning solutions for residential and small commercial buildings from the Irish building technology company Johnson Controls, the company announced from its headquarters in the town of Gerlingen near the south-western city of Stuttgart. In this context, Bosch also intends to fully acquire a joint venture between Johnson Controls and the J…