ᐅ House (built in 2019) always too warm from April to October
Created on: 23 May 2023 07:28
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chewbacca123
Hello everyone, I wasn’t sure under which category to post this topic.
We have been living in our house for about four years now; it was built in 2019. The house is built into a slope, with the ground floor containing the living area, kitchen, workspace, and a small bathroom, and the basement level having the bedrooms, building services, and utility room. The attic is not converted.
Now that it’s slowly getting warmer, I notice again, as I do every year:
It’s so warm inside the house. The heating system, underfloor heating (heat pump), is no longer running. We have a thermometer in the cloakroom on the ground floor. This morning it showed 23.4°C (74°F), stuffy and uncomfortable.
Our house has a ventilation system (Wolf), a central ventilation unit. It runs at night and is supposed to bring fresh air into the house or extract air from the rooms as needed.
How can it be that we always have such heat? 23.4°C (74°F) in the hallway?
Of course, I should mention that we get a lot of sun. On the ground floor, in the living area, there are large south-facing windows which we shade when the sun is shining.
In the basement, the terrace door is 2m (6.6 ft) wide and also exposed to the sun. We shade that partially.
We installed the ventilation system back then because it was said to save us from having to open all the windows every morning. Now, between April and October, I basically spend my mornings opening all the windows anyway to get rid of the stuffy and unpleasant warmth inside the house.
Does anyone have similar experiences? How can it be that after a night with 12°C (54°F) outside temperature, the hallway is 23.4°C (74°F) at 7 a.m.?
When I leave the bedroom and walk up the stairs to the ground floor, I can feel the temperature rising with every step :-/
Could this be related to the building services system? The house was built in 2019, with 36cm (14 inch) Porit bricks.
Thanks for your help, best regards
ina
We have been living in our house for about four years now; it was built in 2019. The house is built into a slope, with the ground floor containing the living area, kitchen, workspace, and a small bathroom, and the basement level having the bedrooms, building services, and utility room. The attic is not converted.
Now that it’s slowly getting warmer, I notice again, as I do every year:
It’s so warm inside the house. The heating system, underfloor heating (heat pump), is no longer running. We have a thermometer in the cloakroom on the ground floor. This morning it showed 23.4°C (74°F), stuffy and uncomfortable.
Our house has a ventilation system (Wolf), a central ventilation unit. It runs at night and is supposed to bring fresh air into the house or extract air from the rooms as needed.
How can it be that we always have such heat? 23.4°C (74°F) in the hallway?
Of course, I should mention that we get a lot of sun. On the ground floor, in the living area, there are large south-facing windows which we shade when the sun is shining.
In the basement, the terrace door is 2m (6.6 ft) wide and also exposed to the sun. We shade that partially.
We installed the ventilation system back then because it was said to save us from having to open all the windows every morning. Now, between April and October, I basically spend my mornings opening all the windows anyway to get rid of the stuffy and unpleasant warmth inside the house.
Does anyone have similar experiences? How can it be that after a night with 12°C (54°F) outside temperature, the hallway is 23.4°C (74°F) at 7 a.m.?
When I leave the bedroom and walk up the stairs to the ground floor, I can feel the temperature rising with every step :-/
Could this be related to the building services system? The house was built in 2019, with 36cm (14 inch) Porit bricks.
Thanks for your help, best regards
ina
chewbacca12323 May 2023 10:02kati1337 schrieb:
It’s not necessary. The bypass doesn’t directly cool; it just prevents heat from being trapped inside the house. But the heating effect that andimann describes, coming through the patio door, the bypass can’t stop that.
We also built with air conditioning. The only other option to avoid overheating too much is very thorough shading. But I find that a bit depressing, having to keep every possible opening covered dark for three seasons. After all, that’s not why you installed those huge windows. =) I agree with you; I find it really depressing to have to shade everything like that all the time. We will probably cover the 2 m (6.5 ft) large balcony window so that the sun no longer shines through. That should make a big improvement!
chewbacca12323 May 2023 10:26chewbacca123 schrieb:
Yes, I agree with you. I find it really frustrating when everything always has to be shaded like that. We are now probably going to cover the 2m (6.5 ft) large balcony window so that the sun no longer shines in. That will improve things a lot! Of course, what I meant was: "everything doesn’t always have to be shaded like that."
chewbacca123 schrieb:
which we shade when the sun is shining.So, you do that yourselves, meaning that when you are not at home, this is not done?https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
R
RotorMotor23 May 2023 11:02The "cooling capacity" of a central controlled residential ventilation system with a bypass can be calculated, since heating 1 m³ (35 cubic feet) of air by 1°C (1.8°F) requires 0.33 Wh of energy.
For example: Outside temperature 16°C (61°F), inside 22°C (72°F). The difference is 6°C (11°F). At 160 m³/h (94 cubic feet per minute), this results in a "cooling capacity" of only about 0.3 kW.
If just one of your windows heats the room with 1 kW of solar gain, you quickly notice that the house gets warmer.
In this case, planning should have included roof design, shading with plants, or external blinds.
Turning off the central controlled residential ventilation system in summer is not a good idea.
The heat recovery prevents warm air from entering the house while still providing fresh air.
For example: Outside temperature 16°C (61°F), inside 22°C (72°F). The difference is 6°C (11°F). At 160 m³/h (94 cubic feet per minute), this results in a "cooling capacity" of only about 0.3 kW.
If just one of your windows heats the room with 1 kW of solar gain, you quickly notice that the house gets warmer.
In this case, planning should have included roof design, shading with plants, or external blinds.
Turning off the central controlled residential ventilation system in summer is not a good idea.
The heat recovery prevents warm air from entering the house while still providing fresh air.
RotorMotor schrieb:
Heat recovery prevents overly warm air from entering the house while at the same time providing fresh air.How does it prevent that? I thought the bypass was used to stop the already warm air from staying that warm? What happens when it’s 30°C (86°F) outside, but only 22°C (72°F) inside because, for example, you’re running air conditioning? Would you operate the mechanical ventilation system with heat recovery or with the bypass in that case?
W
WilderSueden23 May 2023 11:16Heat recovery works both ways. That means warm air from outside is cooled before entering the house. When it is warmer outside than inside (during the day), heat recovery is active; when it is colder outside (at night), the bypass is used.
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