Hello everyone, the title already describes the problem. Approximately 20% humidity in all living and sleeping rooms. We moved in about two weeks ago. That can’t be normal, right? I expected such low humidity only after 2-3 years, but not right from the start...
The first night in the house was really horrible. On top of that, we have been dealing with colds and coughing the whole time. We now have a humidifier running all night in the bedroom (starting in the evening, about 12 hours total) and wake up with around 35-40% humidity.
Could something be set incorrectly in the mechanical ventilation system with heat recovery, or is this low humidity normal in a new house?
What can we do? Apart from the bedroom, we don’t notice it being a problem in any other room. Enthalpy exchangers are supposed to increase humidity by a maximum of 5%, right?!
Thanks for your feedback and best regards
The first night in the house was really horrible. On top of that, we have been dealing with colds and coughing the whole time. We now have a humidifier running all night in the bedroom (starting in the evening, about 12 hours total) and wake up with around 35-40% humidity.
Could something be set incorrectly in the mechanical ventilation system with heat recovery, or is this low humidity normal in a new house?
What can we do? Apart from the bedroom, we don’t notice it being a problem in any other room. Enthalpy exchangers are supposed to increase humidity by a maximum of 5%, right?!
Thanks for your feedback and best regards
M
motorradsilke3 Mar 2023 10:29Ypsi aus NI schrieb:
I was hoping for a more technically global solution to address the problem.
Just open the window slightly at night?
R
RotorMotor3 Mar 2023 10:34motorradsilke schrieb:
Just opening the window a little at night?That would be exactly the wrong approach! It wastes heating energy endlessly.
With 60% relative humidity outside at 0°C (32°F), the absolute humidity is about 2.91g/m³.
If this air is then heated to, say, 18°C (64°F), the relative humidity drops to around 19%.
This is very uncomfortable and unhealthy!
RotorMotor schrieb:
When this air is then warmed to, say, 18 degrees Celsius (64°F), it has only about 19% relative humidity.
Very uncomfortable and unhealthy! Then we’ll be dead soon 😱 ,
we also sleep with the window open and fresh air, not to mention the noise from the birds.
We live in the house like generations before us (I know, they’re already dead) and not in a bunker.
PS: Heating costs are 2500 kWh per year, so incredibly high.
O
Oberhäslich3 Mar 2023 10:47RotorMotor schrieb:
That would be exactly the wrong approach!
It wastes heating energy endlessly. What about turning off the underfloor heating in the bedroom? We sleep with the windows open and need the "cold" from outside. We will also build with controlled ventilation / mechanical ventilation to KfW55 standard, but that would really bother me. Otherwise, maybe sealing the air ducts?!
Oberhäslich schrieb:
What if you turn off the underfloor heating in the bedroom?Our heating in the bedroom and storage room is permanently turned offR
RotorMotor3 Mar 2023 10:52Sorry for the interruption about heating energy waste. Still, I believe that keeping windows open in modern houses nowadays is not a good idea, but that’s not related to this topic. Let’s focus here on moisture. Please address my calculation if you think that leaving the window open would actually improve indoor humidity!
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