To achieve climate neutrality and increase the rate at which building envelopes are renovated, innovative approaches to resource-saving systems for large-scale renovation are required. The EnergySkin system consists of a mounting system and a glass module that actively optimizes the heat flow transmission of existing building envelopes through integrated energy generation and controlled heat production. Simulations of electrical energy generation from organic photovoltaics, in conjunction with simulations of the non-stationary energy requirements of the dynamic wall temperature control system, determine the system's energy balance. The annual balance shows that the system can be energy self-sufficient, if it is oriented to the east, south or west. In this case, an integrated electrical storage system must secure the energy generated for the phases with energy demand, as generation is usually not simultaneous with demand. The daily balance is used to define operating modes, dimension an electrical storage unit, and develop control strategies.