Furniture is an object that accompanies us in everyday life. Therefore, it is important to choose appropriate dimensions, tailored to the human body, which will ensure comfort during use. Due to the noticeable gradual wear and tear of furniture or its components, these products are renewed and renovated. Both external and internal damages are reflected not only in the subjective feelings of furniture users, but also in objective studies showing comfort coefficients in numerical values. The main objective of this study was to compare the comfort of use of two AGA chairs before and after renovation. The objective was achieved by examining the comfort of use for the seat and backrest of both chairs using a sensor mat. The comparison was made based on the results of the tests, which were obtained in the form of color maps of stress distributions, SPD and D coefficients. For the first chair, the original layout was used, the same as in the chair before renovation, with the use of new materials. In the second chair, the upholstery layout was changed in relation to the original. Based on the results obtained, it was noted that during the renovation of used chairs, restoring their original structure results in improved utility properties. However, any changes to the structure that differ from the original upholstery layout may result in the failure to restore the initial level of comfort.