More and more organizations in various fields apply the principles of the Industry 4.0 philosophy. The result, among other benefits, is the acquisition of a large amount of data. Data can have of great importance to them in terms of decision support, analysis and, last but not least, as a source for simulations and computer models. At present, it is possible use various approaches and software applications to create models. One of the applications that allows the creation of computer models in various fields is the Matlab. Diversity of use is ensured by various toolboxes, which are specifically focused on individual areas and thus provide the necessary tools. The presented paper is focused on the possibilities of using fuzzy approach in the design of a computer model in the field of heating. The possible use of the Fuzzy Logic Designer toolbox will be described in the creation of a computer model in the heating of buildings. The basis for creating the model will be historical data obtained from a real object.