Many extensive studies have shown that thermal comfort in inhabited buildings has a strong influence on the quality of life of the occupants. At the same time, it is well known that poor thermal comfort can cause adverse physiological effects.This is the case in Algeria, where collective residential buildings have low thermal performance. According to this fact, most of the inhabitants of these buildings suffer from a great lack of thermal comfort. Similarly, the measurements taken of the state of the insulation of these buildings cannot exclude that a problem related to the thermogenic quality exists and needs to be corrected urgently. In this sense that the objective of this study aims to determine the level of deterioration of thermal comfort by demonstrating the unbearable periods of the year, which create a discomfort among the inhabitants of the collective residential buildings of the Bouzaaroura estate in Annaba. At first, a sociological investigation was established near the inhabitants of this housing estate in order to evaluate their feelings towards the quality of the thermal wellbeing of their housing. Second, a numerical simulation of one of the modelled buildings was carried out using the Design Builder software. The result of the comparative analysis between the results of the survey and the simulation revealed that 91.7% of the inhabitants felt very uncomfortable with the thermal discomfort in their homes, with a Predicted Mean Vote (PMV) indicator of -2.6, a Predicted Percentage Dissatisfied (PPD) indicator of 94%, and that only 44% suffered from heat in the summer, while all of them felt cold in the winter.