Condensation on aluminum front door

In the hallway, the air temperature is about 20°C. The humidity is around 50 percent. We have already replaced all windows and patio doors with new ones and have no problems with condensation anywhere. The frames of all windows have about 15 - 16°C at an outside temperature around freezing point and below.

That can't be right.
At 20°C and 50% relative humidity, the dew point is at 9.3°C.
Apart from that, shouldn't sealing tape have been used instead of foam there? You definitely have a thermal bridge somewhere, that much is clear.
'Daily airing' might be enough in old buildings, but if the house is newer and not equipped with controlled residential ventilation, you will have to increase the frequency considerably.

The door looks like an aluminum model from the 70s, where there was no thermal separation between the inner and outer shell. This amount of water cannot be explained by improper ventilation.

In which winter year is the house standing?

The door has been installed for about three months, so it is brand new. The components are thermally separated.

The house is an old building from 1979.

If condensation occurs at around 14°C frame temperature, there would have to be 65% humidity in our hallway. I should check that.

There is definitely a thermal bridge, as we do not reach less than 15°C on any window frame of the house. Not even at sub-zero temperatures.

The components are thermally separated. The house is an old building from 1979.

There is definitely a thermal bridge, as we do not reach less than 15°C on any window frame of the house. Even not in subzero temperatures.

Then one could speculate in the direction of incorrect choice of installation plane – is the exterior wall single-layered; has thermal insulation been retrofitted?