 The article examined the potential benefits of using alternative, high-efficiency sources of heat and energy for a multifamily residential building in Wroclaw, Poland. It compared the energy efficiency, cost, and environmental impacts of various heating and hot water systems, including those powered by renewable energy sources such as solar panels. The analysis found that the most efficient and economical solution was an alternative system based on highly efficient heat pumps supplemented by a photovoltaic installation. However, this solution has both technical and legal limitations, and requires higher initial investments than other options. This article was authored by Abdraman Ulsebrey, Christof Samansky, and Bartosz Michalak.