The invention relates to a domestic power plant (500), in particular for self-sufficient energy provision of a residential building with electricity and/or heat. The domestic power plant has a housing (550) which has an external air connection (16) and an output air connection (24), and comprises a ventilation device (12) with a heat exchanger (34). The ventilation device (12) is connected to the external air connection (16) such that external air (AUL) can flow in a first air tract (14) via the heat exchanger (34), or via an external air bypass (14') past the heat exchanger (34), into a feed air tract (15) of the domestic power plant (500). The feed air tract (15) runs at least partially within the housing (550). The domestic power plant also has an exhaust air tract (30) in which an air volume flow, brought about by the ventilation device (12), can be propagated within the housing (50). In addition, the domestic power plant has a fuel cell unit (200) which is preferably arranged within the housing (550) and
