In battery electric vehicles (BEVs) the thermal conditioning of the battery pack and the passenger compartment needs special consideration. In an ongoing research project, micro-combined heat and power unit (mCHP unit) concepts with a mechanical power in the range of 1 to 15 kW have been investigated. The mCHP units are plants for combined generation of electrical energy and usable heat for domestic-hot-water (DHW) and space heating in residential buildings. Additionally, the mCHP unit can be combined with heat generators (boilers or suchlike to cover peak loads), heat storages (heating buffer storage and DHW storage) and switchgear including instrumentation and control. A power conditioning unit (PCU), a special mCHP unit concept from the IAV Ltd (Gifhorn, Germany), upgrades a normal mCHP to a trigeneration of power, heat and cold. This concept is integrated into the energy and thermo management of BEV and not in use during parking periods, therefore a mobile integration and additional application of the PCU in adjacent fields could increase the overall sustainability in energy utilization. It is intended to transfer the CO2-reduction potential of a BEV to the owner's house and the PCU enables independence and self-sufficiency in order to increase the acceptance of BEVs. To introduce the dual use of PCU in residential buildings, it is necessary to characterize the typology of buildings and the respective standards of heat insulation, as well as the common energy requirements. Additionally, with a simulation tool based on the VDI 4655 and German Meteorological Service data it is calculated, which unit size belongs to which type of BEV and residential building and whether the use of a PCU could decrease it's CO2-emissions. In Germany, 42% of residential buildings are detached houses [1]. Furthermore, in 2014, 48% of registered vehicles belonged to mid-size and compact class vehicles [2]. Using the example of an average family of three persons living in a detached house and driving a mid-size class battery electric vehicle including a PCU, the applicability, dual use and benefits are investigated. To summarize, the analysis shows that the dual use of a PCU is possible, efficient, reduces CO2-emissions and could increase the acceptance of BEVs. Keywords: mCHP, mobile micro-CHP, combined heat and power, range extender, power conditioning unit, electric mobility