The authors of the article work on the integration of thermoelectricity in facades since 2009. The purpose of this article is to review the possibilities that this technology offers for its incorporation as a building air conditioning system, focusing on the description and analysis of the behaviour of the last prototype made within a research project. For this, the design criteria and the necessary components for its assembly are described, in this aspect the reduction of the thermal bridge with respect to previous prototypes has been especially important. The experimental methodology followed, and the tests performed are explained, critically analysing the results. The conclusions raise improvements and recommendations to implement in future developments.