ᐅ Is decentralized mechanical ventilation really that expensive?

Hello everyone,

I have received a quote for the installation of Inventer fans throughout the entire house. The house is a semi-detached property with approximately 130 sqm (1,400 sq ft) of living space.

The total cost is around €10,500, which I find quite high. The semi-detached house consists of a basement (no fans planned here), ground floor, first floor, and attic.

Ground floor: 2x iV14v, 1x iV Twin, and 1x exhaust fan in the bathroom/shower, with separate control for the ground floor
First floor: 3x iV14v and 1 exhaust fan in the bathroom
Attic: 2x iV14v

I believe the first floor and attic share one control system, but I would need to double-check.

Is this price reasonable or too high? At this price, would it also be possible to install a central mechanical ventilation with heat recovery system?

I would appreciate your help – I really need support here. Thank you.

Best regards,
Robert

Retrofit or New Construction?

New construction! Building will start in about a week. It is a KfW 70 house. Thank you.

For a new build, I would prefer a central controlled ventilation system for living spaces. Decentralized systems are generally intended more for retrofitting.

Given the price, I think a central system should be included. It requires many wall penetrations, and I’m not sure I would find that very appealing.

Does anyone perhaps know a good ventilation specialist in the Greater Cologne area? Thanks.

A quick note about the price. It is clearly too high. For a bit more, we would get a central mechanical ventilation system with heat recovery – but designed for 300 m² (3,229 sq ft) – system Vallox 510SE!