As is already understood in the title of this research topic, “The size of the window as a factor in adjusting the thermal comfort of a well-insulated building”, the purpose is to investigate whether the size and the type of glazing in a building containing external thermal insulation affects the thermal comfort of the occupants inside.

The approach of the above question was initially made theoretical and then practical. In par-ticular, it is initially a presentation on energy consumption and its levels at both global and domestic levels. This is why elements from both printed articles as well as from studies and statistics that have taken place over the years with an emphasis in recent years.

Then, an attempt is made to clarify the basic terms that characterize the specific task, such as solar energy, thermal comfort and overheating. The material was taken from various books as well as from research and diplomatic works of corresponding content.

In addition, in the following chapter are presented the basic features that characterize a glass pane. Still, a little reference is made to the basic types of glass panes that are in circulation, not just years in the market, and their basic features.

Finally, through various simulations in the design builder software, sometimes changing the size of the openings and sometimes the types of glazing in a predetermined building, the levels of overheating inside it are measured. All of the above simulations aim to draw some conclusions about the size of the openings and the types of glazing that contribute to improv-ing the thermal comfort of the occupants at an annual level.