| Class of thermal comfort | Summer | Winter | ||
| Relative humidity, % | Room temperature, ˚C | Relative humidity, % | Room temperature, ˚C | |
| I | 30 - 70 | 23.5 - 25.5 | 25 - 45 | 21 - 25 |
| II | 23.0 - 26.0 | 20 - 25 | ||
| III | 22.0 - 27.0 | 18 - 25 | ||