Hello everyone,
We have been living in our new home with a central ventilation system for just over a year now and are very satisfied so far.
The only issue is the temperature in the attic bedroom (north-east side) in the evening, which is not very comfortable. The room is not even facing south, yet the temperature reaches about 23°C (73°F) in the evening, even though we open the windows wide in the morning to ventilate with cool air and then close the curtains completely.
I suspect that the ventilation system continuously blows warm air from outside (logically) into the bedroom, causing the warm air to accumulate there.
How do you handle this? Is there anything specific to consider?
My ventilation system has been running at level 2 for several months now because I felt the air in the room was fresher, especially during winter. Maybe I could lower it again during summer?
Is there anything else that can be adjusted to improve the situation? Or is the only option to open everything wide for half an hour before going to bed to ventilate again?
I appreciate any advice, tips, or tricks.
We have been living in our new home with a central ventilation system for just over a year now and are very satisfied so far.
The only issue is the temperature in the attic bedroom (north-east side) in the evening, which is not very comfortable. The room is not even facing south, yet the temperature reaches about 23°C (73°F) in the evening, even though we open the windows wide in the morning to ventilate with cool air and then close the curtains completely.
I suspect that the ventilation system continuously blows warm air from outside (logically) into the bedroom, causing the warm air to accumulate there.
How do you handle this? Is there anything specific to consider?
My ventilation system has been running at level 2 for several months now because I felt the air in the room was fresher, especially during winter. Maybe I could lower it again during summer?
Is there anything else that can be adjusted to improve the situation? Or is the only option to open everything wide for half an hour before going to bed to ventilate again?
I appreciate any advice, tips, or tricks.
R
RotorMotor16 Jun 2023 09:04Although this is entirely unrelated to the main topic, I currently see many advantages of underfloor cooling:
- high efficiency: (air-to-water heat pump 5–7 COP, ground-to-water heat pump 50–200 due to passivity)
- very cost-effective if you already have an air-to-water or ground-to-water heat pump
- no dry air (air-to-air heat pumps inherently reduce humidity; on muggy days, however, this can be an advantage)
- silent operation
- no drafts (almost always present with air-to-air heat pumps)
- maintenance-free (with air-to-air heat pumps, you need to ensure hygiene due to condensate, dust, and so on)
The disadvantage is reduced performance at high humidity levels, up to complete shutdown.
And if you don’t like having “cooler” feet, this system won’t make you happy either.
- high efficiency: (air-to-water heat pump 5–7 COP, ground-to-water heat pump 50–200 due to passivity)
- very cost-effective if you already have an air-to-water or ground-to-water heat pump
- no dry air (air-to-air heat pumps inherently reduce humidity; on muggy days, however, this can be an advantage)
- silent operation
- no drafts (almost always present with air-to-air heat pumps)
- maintenance-free (with air-to-air heat pumps, you need to ensure hygiene due to condensate, dust, and so on)
The disadvantage is reduced performance at high humidity levels, up to complete shutdown.
And if you don’t like having “cooler” feet, this system won’t make you happy either.
@rick2018
It is correct and important that you always point out the differences. However, often a total amount is quickly reached that is not affordable. Then you have to consider whether 200 euros might also be enough – as a compromise.
That said, @HeimatBauer is not wrong – it depends on where you live.
My Rhön region is certainly not comparable to the Rhine Valley.
I’ll throw in an outdoor feature that positively influences the microclimate. It does not replace any cooling system, but it is one factor that prevents everything from heating up so extremely. Allegedly, it can reduce the surrounding temperature by up to 10°C (18°F). How much can realistically be achieved (since you can’t implement or want to implement everything) remains to be seen. Everyone knows the pleasant coolness in the shade of a tree. That’s definitely different from a simple sunshade.
More information is available in “more greenery around the house” from the Consumer Advice Center NRW – I find it very factual without any ecological exaggeration.
Maybe just one or another measure can be taken – without breaking the budget.
It is correct and important that you always point out the differences. However, often a total amount is quickly reached that is not affordable. Then you have to consider whether 200 euros might also be enough – as a compromise.
That said, @HeimatBauer is not wrong – it depends on where you live.
My Rhön region is certainly not comparable to the Rhine Valley.
I’ll throw in an outdoor feature that positively influences the microclimate. It does not replace any cooling system, but it is one factor that prevents everything from heating up so extremely. Allegedly, it can reduce the surrounding temperature by up to 10°C (18°F). How much can realistically be achieved (since you can’t implement or want to implement everything) remains to be seen. Everyone knows the pleasant coolness in the shade of a tree. That’s definitely different from a simple sunshade.
More information is available in “more greenery around the house” from the Consumer Advice Center NRW – I find it very factual without any ecological exaggeration.
Maybe just one or another measure can be taken – without breaking the budget.
H
HeimatBauer16 Jun 2023 09:24The shutdown due to high humidity was also my concern. In fact, I experience 0-10 power reductions per year caused by high humidity, usually on days when we have a pool party with all the doors open and a group of soaking wet children running through the living room repeatedly. These power reductions occur at times when I would already be reducing the air conditioning with the system currently under construction. So yes, the power reduction is there and works, but it does not pose a limitation for me in my situation.
Wow, I didn’t expect this to turn into such a discussion – but it’s interesting to see.
We feel pretty much alone with our ventilation system in our new housing development.
I have to agree with @HeimatBauer... Much more money goes into things like interior decoration, painting, fireplaces, etc. – things that, in my opinion, should never be as important as a mechanical ventilation system with heat recovery – but yes, tastes simply differ.
By the way: I have no idea who would sit in front of a fireplace in a tightly sealed building envelope? It feels like it’s 28°C (82°F) in the living area after just 30 minutes! 😀
I find it impressive how much money is actually spent on areas like air conditioning.
But I think we should be satisfied with 22-23°C (72-73°F) in the bedroom. Overall, this is just complaining at a high level... In our old rented apartment, we often had around 28°C (82°F) and really poor air quality.
You should actually appreciate the building envelope we have today... It retains heat extremely well, is much more environmentally conscious, and requires significantly less energy.
We feel pretty much alone with our ventilation system in our new housing development.
I have to agree with @HeimatBauer... Much more money goes into things like interior decoration, painting, fireplaces, etc. – things that, in my opinion, should never be as important as a mechanical ventilation system with heat recovery – but yes, tastes simply differ.
By the way: I have no idea who would sit in front of a fireplace in a tightly sealed building envelope? It feels like it’s 28°C (82°F) in the living area after just 30 minutes! 😀
I find it impressive how much money is actually spent on areas like air conditioning.
But I think we should be satisfied with 22-23°C (72-73°F) in the bedroom. Overall, this is just complaining at a high level... In our old rented apartment, we often had around 28°C (82°F) and really poor air quality.
You should actually appreciate the building envelope we have today... It retains heat extremely well, is much more environmentally conscious, and requires significantly less energy.
H
HeimatBauer16 Jun 2023 11:33What I would like for my ventilation system is the ability to separate the exhaust air ducts so that I don’t have to pass all the exhaust air through the heat exchanger or bypass. For example, in summer, I could send the “warm” rooms’ air directly outside and only route the “cool” rooms’ air through the heat exchanger. Since the silencers are installed before the heat exchanger, I would probably need an individual control for each room… which would be very expensive and require a lot of space. Generally, though, it would be nice if, for example, in summer the exhaust air from the sauna or attic goes directly outside and in winter passes through the heat exchanger. The space above is always open.
Buschreiter schrieb:
I'm glad I'm not living in a submarine or, better said, in a plastic bag. Single-family house built in 1978, decent windows, properly insulated, currently 21.7°C (71°F) in the well-ventilated bedroom. I believe excessive insulation is not beneficial for a comfortable indoor climate. Well, then give yourself a pat on the shoulder.
Hmm…
Prager91 schrieb:
The room isn’t even facing south, and in the evening we have about 23°C (73°F) inside, although in the morning we open the windows wide to air out with cold air and then close everything to keep it dark. Unfortunately, our bedroom in the attic faces south. We ventilate in the evening, and the blinds are down during the day. Still, or maybe because of this, it’s generally not too warm for sleeping. We have found that just 10 minutes of sunlight is enough to warm the room somewhat, and this heat isn’t easy to get rid of.
Prager91 schrieb:
I suspect that the ventilation system continuously blows warm air from outside (logically) into the bedroom, causing warm air to accumulate there. A few days ago, when it was 26/27°C (79/81°F) outside, I took the “trouble” (for this thread) to check the ventilation in the bedroom shortly after 5 p.m.: there was definitely no warm air coming out—rather cool air, not cold, but cooler than room temperature. I don’t have exact temperature readings, but some values you feel more than read (house built in 2013, heating with controlled mechanical ventilation and heat recovery, just above KfW55 standard). The tiles without air conditioning are also nicely cool and actually just right.
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