Given the fact that in the professional literature on marketing, and especially in the segment of green (environmental) marketing, much more research is done and written about B2C markets, this paper is an attempt to explore procurement motives and behaviour of business customers during the complex purchasing process, on the example of several important thermotechnical devices, on the B2B market in Vojvodina. The research aims to collect relevant data from business customers through direct interviews regarding the impact of environmental performance on the procurement of gas boilers, heat pumps and air conditioners in order to obtain quality and reliable information based on the process, that is, conducted the descriptive statistical analysis, which will enable a better understanding of this complex issue. To collect qualitative data, the method of the unstructured deep interview was used. The results confirmed the research hypotheses and indicated the necessity of green marketing in current business conditions. It is indisputable that soon only organisations focused on green marketing and green marketing channels, that is to say, those which are focused on creating their own optimal relationship between their production, distribution and/or sales process, and environmental protection, will be able to gain a competitive advantage in dynamic business markets and achieve maximum satisfaction of environmentally demanding customers, and thus, in fact, at the same time give their full contribution to the sustainable development of the entire community.