Atypically high offer for ventilation system

I have also been considering installing a controlled residential ventilation system for some time. However, I consider saving money with it to be out of the question. Costs for maintenance, filter replacement, cleaning, and electricity consumption likely leave no room for savings. At least in our relatively warm region with a standard outside temperature of -11. I consider it critical to install the air ducts in such a way that you never have to access them again. Retrofitting the controlled residential ventilation system should be possible here with almost no additional effort.

You are absolutely right mEA. I roughly calculated it for myself and just the filters I install annually exceed the amount of energy saved by a factor of three in terms of cost. Controlled residential ventilation is comfort (luxury) that one may/might afford. By the way, I am of the opinion that controlled residential ventilation can help avoid possible problems with tenants (not everyone can ventilate properly, possibly only because no one is present for 10-12 hours). But that rather falls under the category of "buying an improved quality of life with money." But has anyone seriously claimed that this would save (money)?

You are absolutely right, mEA. I roughly calculated it for myself and the filters I install annually alone exceed the saved amount of energy in terms of cost by three times.

It depends on the controlled residential ventilation. My last Vallox (central) and currently RLS (decentralized) did not cost more than 5€ per year for filters. However, I could and can buy the filters myself as mats and cut them to size.

Controlled residential ventilation is comfort (luxury) that one can afford / is willing to afford. I also believe that with controlled residential ventilation you can avoid possible problems with tenants (not everyone knows how to ventilate correctly, possibly simply because nobody is present for 10-12 hours anyway). But that rather falls under the category of "purchasing increased quality of life with money."

Full agreement!

I consider it critical to lay the air ducts in such a way that you can never access them again. Retrofitting the controlled residential ventilation should be possible for us with almost no additional effort.

How exactly does that then take place? Only with suspended ceilings, which do not exist in 100% of the single-family houses I know.

how exactly does that work then? Only with suspended ceilings, which do not exist in 100% of the single-family houses I know.

Our controlled residential ventilation pipes are almost 100% in the floor. But that also means I would have to tear up my floor. And I don't like that (for me it's already annoying but doable because of parquet on cross beam structure, in the other units it's under the screed). But why reversible? That's not possible with electricity, water, etc., either?

Maybe I am being a bit overly cautious. Ventilation systems can also become breeding grounds for germs. That is why I would like to access the ventilation ducts again without a complete refurbishment. I have no ceiling or roof equals ceiling. Hallway, corridor, bathrooms, and guest WC have suspended ceilings. Above the hallway/corridor ceiling, I can lay ventilation ducts into every room.

Actually only if you turn them off. Then possibly leaking condensate cannot dry and together with absorbed dust forms a breeding ground for mold. So always keep them running, (even on the lowest setting during vacation).