In the intermediate periods (from +5°C to +22°C) external air circulates inside the inter-facade void. With an adequate speed of air flows, this circulation can be natural (the so-called ‘stack effect’). Air temperature between the two walls of the facade can take on intermediate values — higher than the external and lower than the internal one, which is advantageous for the comfort within the building. The opening of windows doesn’t lead to a significant cooling of the rooms. The difference between air temperature in the rooms and the temperature of the external wall is also decreasing, which is a positive phenomenon. Both of these are of particular importance for office buildings, where due to lighting conditions windows are most likely to be located next to work sites.

In winter, as in the intermediate seasons, the inter-facade void enjoys higher temperature than the external one, especially in facades exposed to the sun, which prevents the cold air from penetrating inside through opened windows and increases the temperature of the internal facade wall.