Architecture is a discipline combining aesthetics with technology. This paper is focusing on the relationship between aesthetics and energy efficiency in architecture with special interest in solar collectors and photovoltaic panels as technological equipment of the buildings. The paper takes into consideration the present situation and architectural development in northern Poland, with some input basing on European experiences. The paper defi nes aesthetics and effi ciency in the field of architectural design as well as the use of public and urban spaces. Authors present also some case studies regarding the use of solar panels in selected architectural examples. The paper ends with summary and some conclusions including the need for further research in the field of architectural design, technology and product design, as well as the perception of urbanised spaces and the important field of economic and financial factors connected to the topic.