ᐅ Is decentralized mechanical ventilation really that expensive?

Created on: 23 May 2014 12:23

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

Hampek26 May 2014 10:15

#19

A decentralized system was specifically requested for cost reasons. The budget discussed was around €6,000 (approximately $6,600). I never imagined it would cost almost twice as much.

I have already contacted a ventilation specialist. Although his main focus is industrial projects, he has offered his support. He said I still have enough time and shouldn't rush. Tomorrow, I will go to him with the plans.

Best regards,
Robert

Cascada26 May 2014 13:07

#20

Around €6000 sounds very reasonable for a centralized mechanical ventilation system with heat recovery for 130m² (1400 ft²). In a solid construction house, there should be no issues with installing it "afterwards" as long as the screed has not yet been laid. Drilling through the floor slab or ceiling between floors should also not pose any problems. Best regards

Doc.Schnaggls26 May 2014 13:44

#21

Hampek schrieb:
The developer says that moisture diffuses through the walls to the outside, but somehow that doesn’t provide much reassurance.

I have read so much about this in recent weeks that I actually feel more uncertain. Everyone writes and says something different. How is one supposed to form an opinion like this?

Hello Robert,

sorry, but your developer’s statement just makes me shake my head.

Moisture from the living spaces diffusing entirely through the exterior wall...
- No comment -

Take a look online at how many homeowners have experienced severe mold problems due to thick insulation without a ventilation system.

Especially in the first months after moving in, a ventilation system is nowadays almost indispensable if no one is constantly in the house to ventilate. Not to mention the added comfort of not having to ventilate manually...

At the beginning of our own house-building information process, we were also rather skeptical about ventilation systems, but after many conversations with homeowners who are already living in their houses, we are convinced that a controlled residential ventilation system with heat recovery is among the most worthwhile investments when building a house.

emer26 May 2014 13:58

#22

That depends on the wall construction and how KfW70 is achieved.

If it’s a standard 36.5cm (14.4 inches) T10 wall with interior and exterior plaster, and the house meets KfW70 standards thanks to an air-to-water heat pump and a controlled mechanical ventilation system with heat recovery, that doesn’t change the wall construction and is not related to “over-insulation.” Otherwise, almost all houses built in recent years without controlled mechanical ventilation would fail. That’s equally nonsense. But that’s another topic.

Hampek26 May 2014 14:08

#23

KfW70 standard is achieved by:
- Basement walls and floor slab insulated with 14cm (5.5 inches) perimeter insulation
- Exterior walls made of calcium silicate blocks with ETICS thermal insulation system, thermal conductivity 0.032 W/(m·K)
- Mineral insulation between and beneath the rafters (total thickness 22cm (8.7 inches), thermal conductivity 0.032 W/(m·K))
- 2 solar collectors to support domestic hot water production
- Air source heat pump and underfloor heating on ground floor, first floor, and attic
- Large-area radiators in the basement
- Triple-glazed insulating glass units

Regards

emer26 May 2014 15:13

#24

And now you have plastic around it.

ᐅ Is decentralized mechanical ventilation really that expensive?

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