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That’s my point: it’s milder in Ireland and UK (but still cold) in winter. Opening the windows in Germany at -5°C might make sense, but doing so in Ireland at +5°C will bring humidity into your home
It still works, even if the +5degC air is at 100%RH, bringing it in and heating it even to 15degC reduces the RH to just over 50%.
RH is about 80-90% in Ireland in winter- almost constantly damp and average daytime highs are about 7°C
If you take air at 7degC, 90%RH and heat it up to 15degC without adding or subtracting any moisture to it, the RH drops to about 53%
Feb 4, 2026 17:03.. and an indoor RH of 53% is still too high and can cause mould issues
