This research aims to explore the relationships between occupants and climatic parameters, with a focus on thermal comfort. Previous research [Bennadji et al, 2000] shows that buildings recently inhabited take a long time to see a diminution of their internal temperature's amplitude. This paper tries to clarify, by a quantitative study, the importance of the occupiers' behaviour towards their building's adaptation to climate. This paper focalises on one habit behaviour of a single family who moved from a traditional house to a modern flat. The monitoring of the thermal behaviour of the flat shows a very bad adaptation to climate even if the flat was built with better building specifications to avoid heat gain and lost. An investigation about this behaviour was necessarily to explain and demonstrate why people take a long time to understand the physical environment that they are living in and how to react to it. The paper will address the daily behaviour of occupants toward making their accommodation cooler as the climate addressed here is the hot arid climatic zone. During two years; a year before moving place and a year after; the internal minimal and maximal temperatures were taken daily as well as the external ones. The objective of this study is to make architects and designer more aware of people's adaptation to their new properties and the necessity to consider these new properties like a new manufactured product where many aspects of it are not well known. The results show that these buildings exchange with external climate in term of people use of the space and buildings envelop. The measurments done few years later shows a great improvment of the indoor environmental quality in term of thermal comfort achieaved by the users. The aim of this study is to make architects and designers more aware about people behaviour and habit while designing buildings and especially dwellings.