Controlled residential ventilation yes - heat recovery no - justification in the text!

My controlled residential ventilation pipes were also dry this summer, as was the heat exchanger. Explain that to me, Grym? The moisture recovery does not allow germs etc. to pass through. In terms of size, the difference between water molecules and bacteria/fungi is many orders of magnitude too large. Besides, on the warm days when it was over 30 degrees outside, the humidity was below 50, often below 40 percent.

For a long time I was very much in favor of controlled residential ventilation, but I have now revised my opinion.

Hello Grym, I feel the same way and came across your thread during my search. Without wanting to restart the previous discussion, I wanted to ask if you have decided by now? If so, how. I would be very happy to receive an answer.

We will probably include the controlled residential ventilation. Retrofits are not possible and controlled ventilation should definitely be implemented. In the worst case, the controlled residential ventilation can be converted into an exhaust air system, but I just hope that everything works as promised. I would never choose purely manual ventilation for a new house. For me, it was more a question of a central exhaust air system with decentralized supply air or a central supply and exhaust air system with heat recovery.

We currently have controlled residential ventilation without heat recovery (the elements are still missing in the openings - so they are simply wind-protected holes in the wall). In the rooms exposed to the icy east wind, you can feel some drafts and what is especially noticeable is the colder room temperature. I would therefore recommend heat recovery.

The hygienic problems of ventilation systems are known.

Do you actually own a car? Or do you occasionally spend time in trains or airplanes, office buildings or shopping centers? Or hospitals? In the single-family house sector, hygienic problems in connection with controlled residential ventilation are, in my opinion, an urban legend (or in individual cases due to gross planning errors).

Look at the date - the little flag has long since turned again