This paper presents a comparison between field measurements and simulated indoor dry bulb temperatures of a case study of residential building stock in October 6th city in Greater Cairo, Egypt. The measurements were conducted in the winter season of 2013 over one week in January. At the beginning of the study a visual survey was conducted for the case study in order to analyze the building’s construction materials and façade formal configurations. Indoor measurements were conducted to specify the indoor air temperature while outdoor measurements for the ambient temperature were provided by the meteorological Authority for the same period. The Indoor measured air temperature was used to validate the indoor simulated air temperature generated from the building performance simulation commercial code IES< VE>(Integrated Environmental Solutions-Virtual Environment) under the Egyptian climate conditions.