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In construction projects in a field of residential buildings installation and replacement of fillings of openings (windows) play a very important role. A number of requirements is put on newly built windows, in particular in the field of thermal insulation and airtightness. Will the window elements stand the test even after years of use? The aim of this paper is to compare the declared parameter of heat transfer parameter of glazing Ug [W.m-2.K-1] of insulating glasses found from the print on a between the glass frame with the value which can be determined by measuring directly on the building after a certain period of use.

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Temperature stability of a room is of a high relevance to achieve an optimal level of built environment. Standardized calculation models of temperature stability are determined by international standard ISO 13792 based on recently developed empirical models whose approximations can finally be applied. It basically describes two models, however both demonstrate approaches that may not have the best conformity when confronted with the reality. Thus the research objective is to point out an applicability of given calculating models. The paper presents a validation proposal with aim to find an applicable correlation related to current methodology. Finally as result of this study, proposed approximations could demonstrate better consequence to the reality.