Replace simple wooden windows with double glazing in old buildings

Hello,

I own a 97 sqm old building apartment.
The building dates from 2010.
The windows are double windows (i.e. 2 windows behind each other) made of wood and single glazed.

The thermal insulation is a bad joke – in winter it is enough to hold your hand near the window edges to feel the cold air flowing in; energetically, especially in these times, a disaster.

Questions:

[*]An exchange for triple-glazed plastic windows would, as far as I know, be eligible for funding (max. 20%) – correct?
However, there would probably be a massively increased risk of mold infestation – correct?
Active ventilation would probably be difficult to implement due to the very thick exterior walls of this old building.

[*]An exchange for double-glazed plastic windows would, as far as I know, not be (!) eligible for funding at all (nobody has to understand that) – correct?
Would there still be a massively increased risk of mold infestation here or is this no longer really the case compared to the triple glazing?

[*]a) A more cost-effective solution might possibly be sealing, e.g. using self-adhesive sealing tapes.
Would there still be a massively increased risk of mold infestation here?

b) Recommendation for suitable sealing tapes?

[*]Can the energy saving potential of the 3 options be roughly estimated/quantified?

Any other tips on what one could do initially or should do in the long term?

Thanks.

Best regards,

It does not matter whether you choose double or triple glazed windows. The mold is caused by insufficient ventilation and lack of heating. Therefore, the moisture in the air condenses either on the wall or on the window. The solution is not that it condenses on the window, but to heat and ventilate properly. If in doubt, use [Fensterfalzlüfter].

So you should correct the year of construction again. These windows are certainly more than 11 years old (I had ones like these in the old (parents') house, they were removed around 1980 in exchange for double-glazed ISO windows)

so you should correct the construction year again. These windows are certainly more than 11 years old (I had ones like these in the old (parents') house, they were removed around 1980 in exchange for double-glazed ISO windows)

Sorry, the building is of course from the year 1910 (not 2010) :)

It doesn't matter whether you use double or triple glazed windows. The mold is caused by insufficient ventilation and inadequate heating. Therefore, the moisture in the air condenses either on the wall or on the window. The solution is not that it condenses on the window, but to heat and ventilate properly. If in doubt, with window rebate ventilators.

Window rebate ventilators do not constitute a full ventilation system but only guarantee minimum ventilation. In other words: Proper heating and ventilation cannot be replaced by these little things. Well-intentioned advice: Read up beforehand on how to implement whichever measures, about proper ventilation behavior, it’s not rocket science. In old buildings it is easier to get used to wrong ventilation, because constant air exchange is ensured due to poor sealing. I speak from experience...

Box windows can be quite well refurbished. The easiest way is to equip the inner window with self-adhesive sealing tapes. But only the inner window. If the window putty crumbles, then it can also be reglazed.