1 year ventilation system, clarity, facts, electricity costs

but in Halstenbek. It is near Hamburg.

I know it ... Schulenburg, Riess, etc. At least once a year we are there

Now I have to ask a silly question about this, since my lady would like to have a gallery and until now I have actually always been against it, due to the possibly higher load from heating, meaning warming up. Is that really the case, or do you just lose a few square meters of space that you no longer have upstairs?

Now I have to ask a silly question about this, since my lady would like to have a gallery and until now I was always against it, due to the possibly higher heating load, meaning warming up. Is that really the case, or do you simply lose a few square meters of space that you no longer have upstairs?

Does this matter in our insulated new builds? Considering that many afford a higher ceiling on the ground floor... See the above comparison of the m3.? I don't think so.

Does that play a role in our insulated new buildings? Considering that many afford a higher ceiling on the ground floor... See the above comparison of the m3.? I think not.

Yes, I actually think now or by now that it no longer plays such a big role. I used to think differently about that back then hm...

Here are the actual facts about ventilation systems: We have a CWL400 ventilation from Wolf in our new single-family house. At a basic ventilation rate recommended by the manufacturer of 295 m3/h, the device consumes a hefty 170 W. This value matches the CWL datasheet from Wolf (Note, Wolf specifies the consumption per fan motor, so you need to multiply the value by 2. The maximum consumption is 336 W, by the way). Calculated annually, this is an impressive 1489 kWh and corresponds to 357 € at 24 ct/kWh. I find the consumption quite high, making up about ¼ of our electricity consumption, or in € almost half of our heating costs! Obviously, you can reduce the airflow to a 25-watt consumption, but then you are far from the manufacturer's recommendations. I find it strange that the electricity consumption is almost everywhere downplayed as negligible.

Whether one is a friend or foe of such systems is not up for discussion, but rather the note that Werwolf has only considered one side of the cost/benefit analysis.

How much energy could be retained through heat recovery in the house and thus did not have to be "produced" in the first place?