This book analyses the stock of buildings as an important part in the current composition of the city of Kruja, Albania. Initially, all the group of dwellings are analyzed. Considering the analysis this book will focus on the two most important stocks of buildings in the city of Kruja, the historical ones (dating in the XVIII-th century) and the buildings built in the period of socialism (dating between the years 1960-1985). These groups have different socio-cultural, physico-mechanical characteristics, variable energy exchange, different construction materials, different moisture levels, variable temperature, and consequently different coefficients of thermal transmission. The influence of all these characteristics will be strictly analyzed in two different but parallel directions: 1. Questionnaires and 2.Relevant observations (measurements), through two different mathematical regressions methodologies. Based on the relevant data and the methodologies used, dynamic conclusions will be drawn, in order to improve the living conditions of the citizens of Kruja.