This work aims to present an analysis of architectural repercussions involved in choosing a certain climatic system for an office block. The intention is to unite techniques and the building itself. Independently of the bioclimatic design criteria for office work, these buildings require active technical systems for their air conditioning. We should only consider the air conditioning option that allows for regulation of areas and the maximum energetic effectiveness (VAV, fan coils, ducted fan coils, etc). The choice of the final system has serious considerations for both the architect and the building. In this study a representative office floor plan is proposed. Among its features are: an open-plan, certain height, core services and glass retaining wall. For this plan, the different air conditioning systems are analysed focusing on the consequences on the architecture (space occupied, spatial distribution, visual impact, user comfort, etc). These aspects will be studied afterwards for the whole building. This work will allow us to have a summary of the architectural repercussions of each system so that the architect can take decisions before designing the installation.