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
I would actually like to have a controlled residential ventilation system throughout the entire house, but it’s not included as standard with our developer and would probably cost us too much. (To be honest, we haven’t even asked about it yet because I just assumed it would be too expensive for us... maybe we should at least ask.)
It doesn’t seem unusual that it’s not included as standard. Therefore, I find comments claiming that it’s absolutely necessary today and that anything less would be well below standard somewhat strange and sometimes simply unrealistic. That doesn’t mean I think a controlled residential ventilation system is unnecessary, but I do find claims that everything else is worthless to be exaggerated.
It doesn’t seem unusual that it’s not included as standard. Therefore, I find comments claiming that it’s absolutely necessary today and that anything less would be well below standard somewhat strange and sometimes simply unrealistic. That doesn’t mean I think a controlled residential ventilation system is unnecessary, but I do find claims that everything else is worthless to be exaggerated.
Our controlled residential ventilation system consumes about 1 kWh per day (operating 24 hours) with an average air exchange rate of approximately 0.33 per hour, resulting in around 365 kWh per year.
It operates without an enthalpy heat exchanger but includes a mixed-air control that regulates indoor humidity.
just my 2 cents 😉
It operates without an enthalpy heat exchanger but includes a mixed-air control that regulates indoor humidity.
just my 2 cents 😉
R
RotorMotor5 Mar 2023 17:24motorradsilke schrieb:
What’s still missing is the calculation of the consumption of the mechanical ventilation system itself.
I’ve done some quick research and found values between 200 and 500 kWh per year. So even assuming energy use between 200 kWh and 500 kWh due to ventilation, I would save 300 kWh, which equals about 60 euros annually. So financially, it wouldn’t really pay off during my lifetime, even if electricity prices rise. If it’s just about saving costs, you should probably calculate the ventilation system’s operation only during the heating season/winter, not the whole year.
However, once you get used to the comfort, you generally don’t want to switch it off anymore.
Oh, and of course, some people save energy not just for the 60 euros in their wallet but also for the environment. ;-)
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motorradsilke5 Mar 2023 17:49RotorMotor schrieb:
If it’s only about saving costs, you should probably calculate the ventilation system operation only for the heating season/winter, not for the entire year. However, once you get used to the comfort, you usually don’t want to turn it off anymore.
Oh, and of course there are people who save energy not just for the $60 in their wallet but also for the environment. ;-)Of course, you have to calculate for the entire year if you use it year-round. There’s nothing wrong with saving energy if you want to (and can afford it, since the initial investment has to be made first). But what bothers me is how controlled mechanical ventilation is always presented as absolutely necessary and supposedly such a great way to save energy. If I take the 365 kWh mentioned above, there remains a difference of less than 200 kWh, which some people will “waste” on something else.Would it even be permissible to install a controlled mechanical ventilation system together with a fireplace without further precautions (since an exhaust hood can’t work without additional measures)?
Y
Ypsi aus NI5 Mar 2023 18:32motorradsilke schrieb:
Is it generally allowed to install a controlled residential ventilation system directly with a chimney (since an exhaust hood cannot be used without additional measures)? Only with a differential pressure switch that shuts off the controlled residential ventilation system when there is negative pressure.
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