The annual average temperatures recorded in Europe can be divided into 9 bands whose range goes from a temperature below 5.5°C to a temperature above 19°C:

- T > 19.0°C;
- 16.0°C < T < 18.9°C;
- 14.0°C < T < 15.9°C;
- 12.0°C < T < 13.9°C;
- 11.0°C < T < 11.9°C;
- 10.0°C < T < 10.9°C;
- 7.6°C < T < 9.9°C;
- 5.6°C < T < 7.5°C;
- T < 5.5°C.

These 9 bands can be divided into 3 categories in order to simplify the calculation procedure of our thermal dimensioner. This further grouping does not affect the goodness of the result as the intervals outlined require the same cooling and heating inputs:

- T > 14.0°C;
- 10.0°C < T < 13.9°C;
- T < 9.9°C.

Below is the list of European countries with average annual temperatures: Albania 14.0°C; Austria 10.3°C; Belgium 10.8°C; Bosnia 12.3°C; Bulgaria 11.4°C; Croatia 12.6°C; Czech Republic 9.1°C; Denmark 9.2°C; Finland 5.2°C; France 13.2°C; Germany 9.2°C; Greece 19.3°C; Holland 10.5°C; Hungary 11.2°C; Iceland 5.1°C; Ireland 11.3°C; Italy 14.4°C; Kosovo 12.0°C; Luxembourg 10.4°C; Macedonia 12.1°C; Malta 19.6°C; Moldova 11.3°C; Montenegro 13.6°C; Norway 5.4°C; Poland 9.5°C; Portugal 17.5°C; Romania 11.6°C; Serbia 11.6°C; Slovakia 11.5 °C; Slovenia 12.5°C; Spain 17.4°C; Switzerland 11.2°C; Turkey 15.7°C; UK 11.4°C.