ᐅ With or without a central ventilation system – experiences

Created on: 5 Mar 2022 15:32
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SebbSebb
Hello everyone,

We are planning our house build (timber prefabricated house) and are currently considering whether to include a central ventilation system or not. We would appreciate hearing about your experiences with this.

Did you build with or without one, and how satisfied are you with it in everyday life? Is the air inside the house comfortable, or perhaps too dry due to low humidity?

We expect or hope that such a system will provide constantly fresh, unused air inside the house and help prevent mold growth in a tightly built new home. In practice, we won’t be ventilating the house by opening windows 2–3 times a day. To be honest, we already find ventilating by opening windows on cross-ventilation once a day to be a hassle. More realistically, we would occasionally open windows when we feel like it. (We currently live in an older building, where air exchange is not an issue.)

On the other hand, there is the question of how often you actually need to ventilate in a diffusion-open timber construction. Excess moisture should be sufficiently removed anyway. Also, on 160 m² (1,722 sq ft) of living space, any produced moisture and CO2 should distribute well enough.

Such a system is not exactly inexpensive, and we do not know anyone in our family or circle of friends who has had mold in their home, even though they only occasionally open windows and do not ventilate continuously.

It is hard to judge whether this is a great feature to be very glad about later or an expensive investment with little added value. Therefore, we would really appreciate your experiences and advice on this 🙂

Best regards,
Sebastian
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tumaa
8 Mar 2022 10:33
Hello,

the issue with indoor air is simply that houses nowadays are very airtight. Our house is about 260 m² (2,800 sq ft), with 200 m² (2,150 sq ft) living space. It’s quite annoying to ventilate every day. We have a system prepared, and the ventilation unit will be installed at some point :-) ....

A friend once built a semi-detached house with his mother-in-law; he installed a mechanical ventilation system with heat recovery, while she didn’t want one at all... after a few years she regretted it and really wanted one 🙂

Luxury does cost, but I’m happy to treat myself :-)........
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Benutzer200
8 Mar 2022 11:32
tumaa schrieb:

Luxury does cost, but I allow myself that 🙂........
Luxury is the wrong word. In my opinion, quality of life fits better.
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HoisleBauer22
8 Mar 2022 12:33
netuser schrieb:

By the way, ours usually runs at medium level and, except for one valve (which I need to adjust settings on), it is NOT audible.
What system do you have, or which manufacturer? Do you also have ventilation in the basement?
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netuser
8 Mar 2022 12:38
HoisleBauer22 schrieb:

What system do you have, or which manufacturer? Do you also have ventilation in the basement?

Vaillant Recovair
I don’t have a basement 🙂
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SebbSebb
9 Mar 2022 12:08
How does the ceiling height change if the pipes for the system are installed in the screed or below the ceiling? Doesn’t that significantly reduce the usable room height?
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netuser
9 Mar 2022 12:13
SebbSebb schrieb:

How does the ceiling height behave when you install the system’s pipes in the screed or below the ceiling? Doesn’t that reduce the room height significantly?

You definitely need to consider that during the planning phase. However, in our case, there was "no change" because the flat ducts simply disappeared under the screed at the same level as the other pipes and so on...

Construction site: Black flexible pipes run over wooden floor; window in the background.