Additional costs due to incorrectly planned ventilation system + floor-to-ceiling windows?

Hello, is a Novelan LAD 5 DUAL CSD recommended? Or should we opt for a Viessmann VOTOCAL 200-S?

Can't answer that, have it installed with whatever the craftsman is familiar with. I have a Novelan myself, hydraulically demanding, but runs very well. If it should be the Novelan, then rather the LADV5 which modulates..

It can't be answered, let the craftsman install what he is familiar with. I have a Novelan myself, hydraulically demanding, but runs very well. If it should be the Novelan, then better the LADV5 which modulates..

He probably installs Novelan and also gets a subsidy from BAFA for it. LADV5.... doesn't mean anything to me^^ I really just want these things to work.

If you now have the option to have the heat pump inside the house for an extra €400 instead of outside (garage roof), is this sensible in terms of durability.

Novelan probably installs it and is also supported with a subsidy from BAFA. LADV5.... means nothing to me^^ I really just want these things to run. If you now have the option to have the heat pump inside the house instead of outside (garage roof) for an additional 400€, this is sensible in terms of durability.

The LADV5 is the newer successor of the LAD5 and, as mentioned, can modulate. I have never dealt with the question of inside or outside. Durability, I believe, is not really an argument, rather noise emission. The Novelan, for example, uses propane as a refrigerant, which I believe can only be used indoors to a limited extent. Propane is just an inexpensive refrigerant and has little impact on the climate. Fluorinated refrigerants, on the other hand, are real climate killers when leaking.