It is well known that at a European level, a large building fund must be retrofitted by 2050 to meet the climate and energy targets defined by a reduction of greenhouse gas emissions up to 80 - 95% compared to 1990 levels. In this regard, the proposed recast of the energy performance directive defines a new path: going from nearly Zero Energy Buildings to Zero Emission Buildings for residential and non-residential buildings. Thus, practitioners need more adequate instruments to perform reliable field measurements that can later be used for providing retrofit solutions. In recent years it was observed that infrared thermography could be an excellent substitution for already used techniques that require a significant number of sensors or various equipment. The paper presents an overview of the aerial and terrestrial thermography applications and a description of the THERMOG research project, which focuses on using the thermal imaging approach as both a qualitative and a quantitative approach. The project aims to develop a methodology accompanied by software that evaluates the thermal performance of the building envelope under actual operating conditions using aerial and terrestrial thermography methods. The calculation methodology and the associated software will also be used in the structural and energy expertise activity of buildings, as well as in assessing the energy performance of a new building before the reception phase.

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