ᐅ Advantages and Disadvantages of Ventilation and Exhaust Systems

@winnetou78

Something doesn’t seem right here. What is the humidity level in the individual rooms in the evening and in the morning, and how do these values change when you ventilate? How quickly do they rise again after airing out?

Also, please provide the daytime and nighttime temperatures...

The humidity level is normally around 50-60 percent.
After airing the room, it can drop to 38 percent but then rises again when someone is home.

Overnight, humidity in the bedroom can increase to 66 percent.

@winnetou78

The temperatures related to this would be interesting, as heated air tends to be quite dry and your values are at the upper end of the comfort range.

In summer, with plenty of ventilation, we usually have around 60%, but during the heating season it drops to about 30%.

Well, it doesn’t go down that far.

Mycraft schrieb:
No nonsense... It’s called physics... but many were asleep in school... that’s why you get things like this... anything that doesn’t fit their worldview is just lobbying...

Well, you still can’t explain the moisture. Where is it coming from in my bone-dry house? And what physics are you talking about? We maintain 22°C (72°F) inside the house year-round, summer and winter. The walls and floors are fully insulated on the underside, which is what you’d expect in a new house. The house has been standing for 3 years and has since fully dried out. And exactly where was I sleeping, Professor?

By the way, humidifiers were invented for such dry houses—probably just to encourage mold growth, so Mr. Mycraft would be pleased.

kaho674 schrieb:
Where exactly is the moisture coming from in my bone-dry house?

People, animals, plants, cooking, dishwasher, washing machine, showering, bathing, mopping, and so on.

Was that question serious?

The question of how moisture gets into the house is kind of pointless. Because people live inside and release it simply by existing. End of story.

How you ventilate it might be a matter of preference, but whether you need to get rid of it is not up for debate.

Anyone claiming that an occupied and active house is completely dry without any ventilation needs to prove it: Seal everything tight for two days, no kitchen extractor hood, but carry on living normally with cooking, showering, washing machine, dishwasher, breathing, etc. Then measure the indoor humidity. If it’s still completely dry, I’ll admit I was wrong…

kaho674 schrieb:
By the way, humidifiers were invented for such dry houses

They were actually invented for people whose mucous membranes threaten to dry out in the naturally much drier winter season. It’s not about the house but the time of year. Those old ceramic reservoirs weren’t hung on radiators for no reason.