Our construction supervisor (BU) is very honest, and we, as well as others, trust him a lot.
However, he is not a fan of ventilation systems.
Here are the prices he quoted. Are there
1. Solutions that are more integrated into the wall or similar, to avoid additional height increases, and
2. Is the price reasonable?
Total area is 187 sqm (2013 sq ft), including about 40 sqm (430 sq ft) of an extension. The rest is spread over two levels in a town villa style.
There is a ceiling opening of about 9 sqm (97 sq ft) to the first floor, which is not included in the 187 sqm (2013 sq ft).
Attached is the text from the BU.
Pluggit Avent fresh air unit with heat recovery included.
Aluminum cross counterflow heat exchanger
Including air ducts, supply and exhaust air outlets, silencers, distributor, cover grilles in standard white plastic, supply and install 14,192.58 €
Blower door test mandatory when installing ventilation system 476.00 €
Increase of total floor construction height from 14 cm (5.5 inches) to 18 cm (7 inches) on the upper floor
By adding 3 cm (1.2 inches) more styrofoam insulation 2,988.97 €
Enthalpy exchanger and summer bypass
No costs yet
However, he is not a fan of ventilation systems.
Here are the prices he quoted. Are there
1. Solutions that are more integrated into the wall or similar, to avoid additional height increases, and
2. Is the price reasonable?
Total area is 187 sqm (2013 sq ft), including about 40 sqm (430 sq ft) of an extension. The rest is spread over two levels in a town villa style.
There is a ceiling opening of about 9 sqm (97 sq ft) to the first floor, which is not included in the 187 sqm (2013 sq ft).
Attached is the text from the BU.
Pluggit Avent fresh air unit with heat recovery included.
Aluminum cross counterflow heat exchanger
Including air ducts, supply and exhaust air outlets, silencers, distributor, cover grilles in standard white plastic, supply and install 14,192.58 €
Blower door test mandatory when installing ventilation system 476.00 €
Increase of total floor construction height from 14 cm (5.5 inches) to 18 cm (7 inches) on the upper floor
By adding 3 cm (1.2 inches) more styrofoam insulation 2,988.97 €
Enthalpy exchanger and summer bypass
No costs yet
What causes the floor structure on the ground floor to be 18 cm (7 inches) thick, while on the upper floor it is only 13 cm (5 inches)? And if anything, that is just a bit of expanded polystyrene. That costs almost nothing. It is more likely due to the additional row of bricks to keep the ceiling height consistent.
A ventilation system is not installed primarily to prevent mold. That is just a beneficial side effect.
Today, I would not build a house without a mechanical ventilation system with heat recovery. I don’t consider it up-to-date. I have retrofitted decentral mechanical ventilation systems myself, but that is not the optimal solution.
Today, I would not build a house without a mechanical ventilation system with heat recovery. I don’t consider it up-to-date. I have retrofitted decentral mechanical ventilation systems myself, but that is not the optimal solution.
X
xMisterDx10 Dec 2023 12:30Why would you turn them off?
We have a decentralized ventilation system with heat recovery, and we've measured 45-50% relative humidity in each room individually, even though the windows haven’t been opened for several weeks. In summer, you switch to summer ventilation mode and bring in cool air at night.
Do you want and can you afford to ventilate by fully opening windows 3, 4, or 5 times a day during the first few years? Good luck with that.
We have a decentralized ventilation system with heat recovery, and we've measured 45-50% relative humidity in each room individually, even though the windows haven’t been opened for several weeks. In summer, you switch to summer ventilation mode and bring in cool air at night.
Do you want and can you afford to ventilate by fully opening windows 3, 4, or 5 times a day during the first few years? Good luck with that.
H
HoisleBauer2210 Dec 2023 15:24In 2021, the mechanical ventilation system with heat recovery cost us an additional €13,000.
The controlled residential ventilation system would have cost us around 15,000 (material and installation) through the heating contractor, but we are now installing it ourselves with material costs of about 10,000. The blower door test is carried out by the energy consultant and must be paid for in both cases.
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WilderSueden10 Dec 2023 17:02lastdrop schrieb:
You don’t install a ventilation system just to prevent mold. That’s a nice side benefit.Well, yes and no. At some point, even new construction walls fall below the dew point. We’ve been living here since February and still have indoor humidity levels above 60% routinely. And that’s despite having the fans set to 4-5 air changes per day and me additionally airing out 1-2 times daily through windows during winter. I don’t even want to imagine how it would look without the ventilation.Of course, comfort also plays a role. Ventilating during strong winds is no fun, nor is cold air in winter. But I would never accept the builder’s claim that mold isn’t an issue, so ventilation isn’t needed. Unfortunately, there are still some builders who haven’t caught up with the 21st century. I would definitely try to build with centralized mechanical ventilation with heat recovery.
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