ᐅ Advantages and Disadvantages of Ventilation and Exhaust Systems

kaho674 schrieb:
How is the experience after 5 years?

Fresh air inside the house like on the first day, even after 6 years... without the need to open windows.

After 3 years of continuous operation, the ventilation system was modified and I posted some pictures showing the inside and the ductwork... these must be floating around here somewhere...

The power consumption is listed in the data sheet of every ventilation system... under normal use, about 100 euros per year.

Yes, the consumption can be seen in the datasheets. So, I am a bit surprised that @Hausbauer1 hasn’t found anything on that yet.
50W in continuous operation would be about 438 kWh. That is quite significant and definitely noticeable. It’s roughly equivalent to two refrigerators. However, the unit is still cost-effective thanks to heat recovery, at least in terms of operating costs.

Technical datasheets can contain a lot of information. In cars, the officially measured fuel consumption often differs from actual usage. That’s why I’m interested in real-world experience, and as you can see, opinions on energy consumption alone vary quite a bit.

Then there are filters. From time to time, they apparently need to be cleaned. I’m not sure what else to consider—for example, if you don’t have the standard version, such as one with cooling or humidity recovery. I would really like to hear some genuine user experiences here.

I also have another question: For those who have a controlled ventilation system for living spaces, have you foregone windows that can be opened fully or partially? Well, probably not completely because of emergency escape requirements, but it would be interesting to know your experiences with this.

@Hausbauer1

We have at least one top-hung ventilating window in every room, but will we ever actually need them?

Regarding the escape route, you need two of them, although they can lead through a shared corridor.

kaho674 schrieb:
Exactly.

I’m curious to know who has had a central ventilation system for, let’s say, more than 5 years? Is there anyone here? How often is it (still) running? What has been the experience after 5 years?

I’ve only had mine for 3 years and I’m very satisfied. We once had a power outage in the area for 5 hours, and after a much shorter time I clearly noticed the air quality deteriorating and opened windows to ventilate.

Apart from that, your theoretical nonsense about never ventilating in a modern airtight house is completely absurd. In addition to the moisture generated everywhere during everyday use, there are many other indicators of good air quality (from CO2 concentration to odors—almost everything inside a house emits something into the air…). It’s no argument to say that nothing happens if you don’t ventilate (which is also incorrect regarding moisture). You don’t build a house for 400,000 euros including land or more just to live in stale air. Especially since you yourself argue that there is a difference between theory and practice, yet you ignore your own points.

Besides, theory can often be quite reliable; otherwise, many things in the world wouldn’t work, such as bridges or cars—I mention this because of the foolish comparison that ventilation systems might use more electricity than stated because cars do. The consumption of cars is determined on a test cycle on the dynamometer for comparison purposes, but on real roads, a person certainly drives differently… The energy use of the ventilation unit is that of an electric motor running basically constantly (the consumption naturally depends on backpressure/settings, but the manufacturer usually provides a chart for that).

Edit: So apparently grades were handed out generously at your school? For those who need to try in order to “show off”...

Saruss schrieb:
Besides the moisture that is always present in daily use, there are more indicators of good air quality (from CO2 concentration to “odor,” almost everything inside a house releases something into the air…), so it’s not an argument that nothing happens if you don’t ventilate (which is also wrong regarding moisture). Nobody builds a house for 400,000 euros including the land or more just to live in stale air. You yourself argue that there is a difference between theory and practice, yet you ignore your own arguments…

I have no idea what you are talking about. I said myself that without ventilation no visitors would come anymore. I meant the stale air and poor air quality.

Saruss schrieb:
Edit: so your school must have handed out grades for free? Anyone who needs to try to “show off” like that…

Sweetheart, that was over 20 years ago. Those grades don’t matter to me anymore. But maybe you missed the context, just like above.