“…The significance of different components of the heat balance was further explored by several authors, especially the incorporation of solar gains into the models [24], [25]. The impact of neighbouring zones and the weight of the building structure [17], [21], [26] were also separately investigated, as well as the feasibility of replication of the experiment in different climates [27], [28]. Research on the co-heating test also evolved towards the usage of the building's own heating system [29] and adaptation to in-use buildings [30].…”