Window replacement: advantageous or not?

Hello, I live in a rental apartment and find that cold air falls down from the roof windows Velux lead time window designation TGL 22065 R90. In other words, they do not keep the cold out very well. In addition, water always collects in the corners and the wood always molds a bit. I clean them and also treat them with mold inhibitor, but it keeps coming back. Now I wonder... would new windows with new panes that insulate better prevent the moisture from occurring? And would I save on heating costs? Of course, new always brings improvement, but I do not know how old the windows are and maybe such things are really replaced because the time has come. I would like to have helpful information here so that I can better assess this. Thank you very much

Of course, new things always bring an improvement

That is not quite right. When the windows in an old apartment are suddenly replaced and the apartment is sealed, the occupant has to change their ventilation behavior very quickly. Otherwise, the whole place will get moldy.

What does your landlord say about that? You don’t want to replace the window yourself, do you? Even with new windows, you will have that problem. Maybe less intense, but where there is moisture and a cold surface, water will condense. The only help is: wipe and ventilate ventilate ventilate.... Especially after showering, cooking, and when you hang up laundry.

Hello,

as [Der Da] has already written, replacing the windows does not necessarily lead to an improvement with these problems.

In our current apartment (built in 2001 - low energy standard at the time) we also have two plastic roof windows that tend to cause condensation at the current outside temperatures.

There is really only one thing that helps: dry wiping, ventilation, and reheating, because warm air can absorb more moisture than cold air.

Best regards,

Dirk

I also think that replacing the windows often does not bring any improvement. Here, the ventilation behavior actually needs to be changed. The landlord will be reluctant and install new windows for you, you can forget about that.

Hi
if the insulation values of the windows are so poor that condensate forms despite a normal room temperature of 21°, in my eyes that is a defect. Replacing the windows then falls under maintenance and not modernization, so it cannot be passed on to the landlord through higher rent. I have installed 4 Velux windows myself from around 1990, and there is no condensate at all. Not even when the room is only 18°.
Roof windows often have the option to take a ventilation position that is rainproof. Proper ventilation should be a habit in every apartment, whether new roof windows or not. I would talk to the landlord.