*5.5. The Dependence of the Time of the Heating Season on the Thickness of the Insulation*

The dependence of the length of the heating season on the insulation thickness is shown in Figure 14.

**Figure 14.** Variability of the duration of the heating season as a function of insulation thickness.

The diagram in Figure 14 clearly shows the dependence of the heating season on the "insulation" of external walls. Increasing the thickness of the insulation shortens the heating season, which contributes to reducing the annual heat consumption for heating purposes. For comparison, the graph also shows (red) the time determined on the basis of the annual variability of the outside air temperature. This time is approximately in line with the calculation method adopted for the wall without external insulation (x = 0). This confirms the correctness of the adopted calculation methodology and the correctness of the performed calculations.
