ᐅ Newly built apartment (KfW-55 standard) cannot be cooled below at least 25 °C.
Created on: 21 Aug 2022 08:52
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Forsberg21
Hello,
I have rented out a new apartment (built in 2021, KfW-55 standard). The tenant recently informed me that since spring, the indoor temperatures have consistently been at least 25°C (77°F) or higher. On warm days, it even reaches up to 28°C (82°F), although she keeps all the aluminum shutters closed during the day (no home office). Cross-ventilation at night doesn’t bring the temperature below 25°C (77°F). She is asking for advice on how to cool the apartment down a bit during the summer.
What could be causing this?
The apartment has a decentralized ventilation system and underfloor heating, which is naturally turned off in summer.
The apartment faces southwest and has large window areas.
Could it be that the ventilation system continuously brings in warm outside air on hot days, causing the temperature to rise so much?
Should the ventilation system be turned off during the day?
But why doesn’t the apartment cool down at night, even though there seems to be cross-ventilation and the nights are cooler?
Do you have any tips? I am a bit overwhelmed.
Best regards,
Robert
I have rented out a new apartment (built in 2021, KfW-55 standard). The tenant recently informed me that since spring, the indoor temperatures have consistently been at least 25°C (77°F) or higher. On warm days, it even reaches up to 28°C (82°F), although she keeps all the aluminum shutters closed during the day (no home office). Cross-ventilation at night doesn’t bring the temperature below 25°C (77°F). She is asking for advice on how to cool the apartment down a bit during the summer.
What could be causing this?
The apartment has a decentralized ventilation system and underfloor heating, which is naturally turned off in summer.
The apartment faces southwest and has large window areas.
Could it be that the ventilation system continuously brings in warm outside air on hot days, causing the temperature to rise so much?
Should the ventilation system be turned off during the day?
But why doesn’t the apartment cool down at night, even though there seems to be cross-ventilation and the nights are cooler?
Do you have any tips? I am a bit overwhelmed.
Best regards,
Robert
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Bertram10021 Aug 2022 10:40K a t j a schrieb:
It looks like a slum, no offense intended.I don’t care what the neighbors think about it. I can only say that, regarding indoor temperatures, I haven’t done much wrong. Statements comparing it to slums just reveal how arrogant and out of touch some people have become toward others (or things).
In case it’s not obvious: for the previous photo, I arranged the cloths—often called “rags” by Katja—by spreading and shifting them so you can see all the configurations. I believe I did nothing wrong by showing everything in one photo. Slum dwellers might not be as clueless as the rags they hang.
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Forsberg2121 Aug 2022 10:42Thank you for the responses.
I am the landlord and could definitely consider installing blinds inside—at least in the living room.
Which type of blinds would be most effective?
I am the landlord and could definitely consider installing blinds inside—at least in the living room.
Which type of blinds would be most effective?
Bertram100 schrieb:
I don’t care what the neighbors think about it.
...
Such a statement [...] just reveals how arrogant and out of touch people have become towards others (and things). Funny. As I said, I didn’t mean to offend anyone.
Forsberg21 schrieb:
I am the landlord and could definitely consider installing blinds inside—at least in the living room.
What type of blinds would be most effective? That makes little to no difference. Once the heat passes through the glass, nothing can stop it anymore.
I also highly doubt that the installed heat pump has a cooling function.
The electricity-intensive part would then be the air-to-water system; the ground-source system only uses a small amount of pump electricity.
And once the heat is inside the building, you can’t get rid of it with those fancy cloths—at best, you can prevent further temperature increases.
I’ve been reading since spring? At that time, the underfloor heating was still running.
Has the tenant ever talked to the other residents in the building? Especially those on the same side and directly above.
The electricity-intensive part would then be the air-to-water system; the ground-source system only uses a small amount of pump electricity.
And once the heat is inside the building, you can’t get rid of it with those fancy cloths—at best, you can prevent further temperature increases.
I’ve been reading since spring? At that time, the underfloor heating was still running.
Has the tenant ever talked to the other residents in the building? Especially those on the same side and directly above.
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Bertram10021 Aug 2022 10:49K a t j a schrieb:
That doesn’t help much, if at all. Once the heat passes through the window, nothing stops it anymore. You don’t know my patchwork construction. What you say isn’t true. It does make a difference whether you hang curtains, cloths, or other items inside in front of the window or not. Maybe not after three weeks of 30°C (86°F), but every day you can keep the heat out inside is still comfortable.
Plants inside the house also help make the indoor climate feel less warm.
Altogether, that’s definitely more than nothing.