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
HeimatBauer schrieb:
In the utility room, I optimized the supply air to better serve the photovoltaic system and server cabinet, confirmed by measurements.It's interesting that you have supply air in the utility room. I usually understand such rooms to be exhaust air spaces. Since we will also have a server cabinet and photovoltaic system in the room, I would be very interested in your design and optimization. 🙂
H
HeimatBauer13 Dec 2023 11:13The utility room houses everything from heating and ventilation to the server cabinet, photovoltaic system, washing machine, and drying area. That’s why I installed both supply and exhaust air, along with a soundproof, airtight door. When the door is closed, you can hear absolutely nothing from the ventilation. Of course, no air can enter or exit then, so supply and exhaust air are essential. I would definitely do it this way again.
The plumber routed the supply air directly out above the silencer, and the exhaust air at the opposite end of the room, also near the ceiling. I monitored the temperatures for a while and noticed strong layering, meaning the air exchange at the bottom (where the photovoltaic system needs cold air) was too warm. I then directed a duct from the silencer outlet down to floor level. Now, fresh air is distributed much better throughout the room, and the temperature and humidity stabilize more evenly and reach target levels faster, with fewer peaks.
The plumber routed the supply air directly out above the silencer, and the exhaust air at the opposite end of the room, also near the ceiling. I monitored the temperatures for a while and noticed strong layering, meaning the air exchange at the bottom (where the photovoltaic system needs cold air) was too warm. I then directed a duct from the silencer outlet down to floor level. Now, fresh air is distributed much better throughout the room, and the temperature and humidity stabilize more evenly and reach target levels faster, with fewer peaks.
Absolutely Pro Controlled Residential Ventilation
You can save the most money by having round ducts cast directly into the in-situ concrete, rather than installing flat ducts that are three times more expensive—or better yet, doing it yourself.
We have 171 sqm (1,840 sq ft) and altogether we paid 8,000 (without the safety surcharge from the structural engineer for steel/concrete in the intermediate ceiling), while the heating contractor would have charged 14,000 for a smaller system. Construction year 2021/22.
If your general contractor is not enthusiastic about it but would still do it, insist on proper system design (preferably oversized with more ducts rather than running at maximum load).
Want a small taste?
https://www.hausbau-forum.de/threads/kontrollierte-wohnraumlueftung-waermerueckgewinnung-luftbrunnen-dunstabzug-abluft-und-unabhaengiger-kamin.38086/post-545490
Conclusion after 1 year of operation.
Indoor humidity in winter around 30% (yes, it’s dry).
Little dust, almost ZERO mosquitoes/flies, absolutely PRO Controlled Residential Ventilation.
This investment CANNOT be retrofitted, so it’s best to include it from the start.
You can save the most money by having round ducts cast directly into the in-situ concrete, rather than installing flat ducts that are three times more expensive—or better yet, doing it yourself.
We have 171 sqm (1,840 sq ft) and altogether we paid 8,000 (without the safety surcharge from the structural engineer for steel/concrete in the intermediate ceiling), while the heating contractor would have charged 14,000 for a smaller system. Construction year 2021/22.
If your general contractor is not enthusiastic about it but would still do it, insist on proper system design (preferably oversized with more ducts rather than running at maximum load).
Want a small taste?
https://www.hausbau-forum.de/threads/kontrollierte-wohnraumlueftung-waermerueckgewinnung-luftbrunnen-dunstabzug-abluft-und-unabhaengiger-kamin.38086/post-545490
Conclusion after 1 year of operation.
Indoor humidity in winter around 30% (yes, it’s dry).
Little dust, almost ZERO mosquitoes/flies, absolutely PRO Controlled Residential Ventilation.
This investment CANNOT be retrofitted, so it’s best to include it from the start.
HeimatBauer schrieb:
A pipe is a pipe is a pipe, and water can’t escape from it. With the important caveat that it has to go somewhere. For us, it’s under the screed – and I will never get back there. That’s why I had all the pipes pre-routed and left dangling in the utility room. Consider how to run the supply and exhaust air through the walls, and then everything is set up in advance. The unit itself is much cheaper online than from the general contractor.
Oh, and you also need an outlet. And space.
R
Radfahrer17 Dec 2023 12:35I have been considering installing a mechanical ventilation system with heat recovery for some time now.
However, I believe it is unrealistic to expect it to save money.
Costs for maintenance, filter changes, cleaning, and electricity consumption are unlikely to allow for any savings.
At least this applies to our relatively warm region, with an average outside temperature of -11°C (12°F).
I find it problematic to route the air ducts in a way that they are never accessible again.
Upgrading to a mechanical ventilation system with heat recovery should be possible here with almost no additional effort.
However, I believe it is unrealistic to expect it to save money.
Costs for maintenance, filter changes, cleaning, and electricity consumption are unlikely to allow for any savings.
At least this applies to our relatively warm region, with an average outside temperature of -11°C (12°F).
I find it problematic to route the air ducts in a way that they are never accessible again.
Upgrading to a mechanical ventilation system with heat recovery should be possible here with almost no additional effort.
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