We have a Zehnder Q350 with ET and actually struggled with air that was too dry already in the first winter.
I can report rather the opposite for us:
We built with solid construction (including the interior walls!) and everywhere there is lime plaster with a grain size of 1.2mm except in the bathrooms (there is lime-cement plaster there).
We left the lime plaster unpainted due to its diffusion capability and the plasterer's advice.
The ventilation system is a Vallox ValloPlus 350 MV-E (so with enthalpy heat exchanger).
The system was set up in half a day with air measurement of all inlets and outlets by a technician.
The air exchange rate is about 0.3.
After more than a year in operation, we have at least 50% humidity in winter and mostly between 70-80% in summer ops:
As a result, we ordered a normal heat exchanger without enthalpy on the internet and exchanged it before winter (20.11.2019).
Currently, we usually have between 50-60% humidity...
Last winter at this time it was more than 60%.
We thus hope to get below 50% by the end of winter so that we won’t end up at 70-80% again in summer.
According to the architect, this is partly due to the lime plaster, as it stores moisture and releases it again.
Attached are the current recordings from this week as well as from the month
(The peaks are mostly from showering)
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