Pros and Cons of Ventilation and Exhaust Systems

How is the experience after 5 years?

Fresh air in 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 was rebuilt and I posted some pictures of how it looks inside and in the ducts... they must be floating around here somewhere...

The power consumption is stated in the data sheet of every ventilation unit... in normal operation about 100 euros per year.

yes, the consumption can be seen in the datasheets. In this respect, I am surprised that claims not to have found anything about it yet. 50W in continuous operation would be about 438 kWh. That is not insignificant and quite noticeable. About as much as two refrigerators. But: The thing is profitable precisely because of the heat recovery, at least in terms of operating costs.

There can be a lot in the datasheets. For cars, the officially measured consumption rarely matches the actual consumption. Therefore, I am interested in the empirical values, and as you can see, opinions on electricity consumption alone differ significantly.

But then there are filters. From time to time, cleaning is apparently necessary. I don’t know what else needs to be considered – for example, if you don’t have the standard version, such as with cooling or humidity recovery. I would simply be interested in real empirical values here.

And I have one more question: Those who have a controlled residential ventilation system, have you completely or partially given up on windows that can be opened? Well, completely is probably not possible because of the escape route, but it would also be interesting to hear the experiences here.

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

Regarding the escape route, you need two, although these may also lead through a common corridor.

Exactly.

I would be interested to know who – let's say for longer than 5 years – owns a central ventilation system? Is there anyone here? How often is it (still) on? What is the experience after 5 years?

I have had it for only 3 years and am very satisfied. We once had a power outage in the area for 5 hours and after a much shorter time I clearly noticed that the air quality worsened and I ventilated.
Apart from that, your theoretical babbling about not ventilating even once in a modern airtight house is infinitely preposterous. Because besides the moisture that accumulates everywhere during use, there are more indicators of good air (from CO2 concentration to "stink"; almost everything in a house emits something into the air...), so it is no argument that nothing happens if you don’t ventilate (which is also wrong with regard to moisture). You don’t build a house for 400,000 euros with land or more just to live in stuffiness, do you? Especially you yourself argue that there is a difference between theory and practice, but you ignore your own arguments...
Apart from that, the theory is often even quite good, otherwise many things in the world would not work, e.g. bridges or cars – I’m bringing this up because of the stupid comparison that ventilation systems might consume more electricity than specified, because cars do too. Their consumption is stated on the test bench according to a fixed measurement cycle for comparability, but a person obviously drives differently on real roads... The ventilation consumption is that of an electric motor that basically runs constantly (the consumption here naturally depends on backpressure/settings, but the manufacturer usually provides a diagram for that).


Edit: so I guess grades were handed out at your school? To those who feel the need to try to "show off"...

Because besides the moisture that is present everywhere when in use, there are more indicators of good air quality (from CO2 concentration to "stench", almost everything in a house emits something into the air...), it is not an argument that nothing happens if you don’t ventilate (which is also wrong regarding moisture), you don’t build a house for 400,000 euros with land or more just to live in stench? Especially you yourself argue that there is a difference between theory and practice but you ignore your own arguments..

No idea what you’re talking about. I myself said that without ventilation there would be no visitors anymore. I meant the stench and bad air.

Edit: at your school, grades were probably handed out for free? Whoever needs to try that “to brag”…

Sweetie, that was over 20 years ago. Those grades no longer matter to me. But maybe you missed the context, just like above.