Installation location of central ventilation unit

The parts are quiet, ours is not louder than a fan.

And out of 6 houses on our street, only 2 have a cold roof.

Maybe depending on the area, I have almost never seen an insulated [Sptzboden] here. Our ventilation system is already quite loud at full power, and I didn't find others much quieter either. It's just my opinion, I wouldn't have wanted that thing on the roof. Since we have a [LEWT], it wouldn't be possible anyway, or even more impractical.

Who voluntarily builds a cold roof? Insulation is needed anyway, the extra cost of putting it in the roof is minimal, the gain in usable space considerable. I wouldn't worry about noise either, it can't really be "worse" than having the system in a room on the living floor. A ventilation system almost never runs at full capacity if it is properly sized.

Who would voluntarily build a cold roof? You need insulation anyway, the extra cost of putting it into the roof is minimal, the gain in usable space is considerable. I wouldn’t worry about noise either; it can’t really be "worse" than having the system in a room on the living floor.

A ventilation system hardly ever runs at full capacity if it’s properly sized.

A cold roof is cheaper, Styrofoam costs nothing. A decent on-roof or between-roof insulation costs a few thousand more.

You hear noise directly below, but not significantly more than if placed on the ground floor.

Of course, that's nonsense. Programs for "shock ventilation," for example in the morning and evening, make sense; the system then runs close to maximum. In summer, you can use the system for cooling; it also works with an air exchange rate of 1, which is "full throttle" for a single-family house controlled living space ventilation. Extending the insulation up to the ridge has the advantage of frost-free storage space, but that's about it. The disadvantages are that you have to ventilate there, otherwise things can go badly, it is more expensive to purchase, and, although minimal, more expensive in heating costs.

What is supposed to be sensible about that. An air exchange rate of 0.4 per hour is multiple times the normal possible ventilation behavior of a person. To want to apply a power function to that again ... well.

Surcharge for warm roof maybe 3k. Total peanuts for the increased usability of this area (e.g. then heating or ventilation can go there instead of taking up space in living floors).