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
Y
Ypsi aus NI10 Mar 2023 14:57We had construction dryers here during the summer (August) to speed up the screed drying process before tiling. A considerable amount of water was collected. Could this be the reason why we are already so dry now?
Apolyxo schrieb:
- I doubt that an ERV only accounts for 5%. Especially with your extreme values, you’re probably looking at 10% or more. Our ERV works very well. Another advantage: With an ERV, the mechanical ventilation can run down to about -7° Celsius (19°F) outside temperature. Do you mean 5% relative or absolute humidity inside the house, or how much moisture the ERV returns? An ERV can recover about 70% of the moisture in the air.
P.S. Does your mechanical ventilation stop working at -7 degrees? If so, why?
P.P.S. Why do you think a mechanical ventilation system always needs an ERV? There are other very good solutions that work just as well.
Ypsi aus NI schrieb:
Does everyone here who has mechanical ventilation really have an ERV? No, it’s not mandatory, but it’s easier to retrofit than, for example, a mixed air control system.
R
RotorMotor10 Mar 2023 16:54Dogma schrieb:
No, it’s not necessary, but it’s easier to retrofit than, for example, a mixed air control system. What exactly is a mixed air control system in a centralized mechanical ventilation system with heat recovery, and what benefits is it supposed to provide?
RotorMotor schrieb:
What is a mixed air control in a central mechanical ventilation system with heat recovery, and what is its main purpose? Essentially, it is a bypass of outdoor air and exhaust air before it enters the mechanical ventilation system with heat recovery. It allows control of indoor humidity and/or can be used to preheat the incoming outdoor air by mixing it with the remaining heat in the exhaust air that is not recovered by the heat exchanger. This is especially useful at cold outdoor temperatures, where even exhaust air at around 10°C (50°F) still contains usable heat.
Tolentino schrieb:
We don’t have one yet and are at about 32%. But we also have rather low steps inside and a thousand plants. Enthalpy and all rooms consistently above 45% relative humidity. Nominal ventilation. I am very satisfied with the ventilation system – the first winter after construction it was consistently too humid, now in the second winter it is just right.
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