ᐅ Newly built apartment (KfW-55 standard) cannot be cooled below at least 25 °C.
Created on: 21 Aug 2022 08:52
F
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
Nutshell schrieb:
Don’t believe everything.
No one here has reached 20 degrees Celsius (68°F) after weeks of drought, sun, and clear skies… except at 3 a.m. at an open window. This summer was hot, but at night it was almost always below 20°C (68°F).
That’s why inside I never had more than 22°C (72°F) on the ground floor and 23°C (73°F) upstairs – without air conditioning.
Snowy36 schrieb:
So what is the reason that you seriously have 20 degrees max 23 and I 25? Are we talking about the ground floor or upper floor? Do you open the windows at night or how exactly does that work? Ground floor and upper floor.
The windows are shaded where the sun is currently shining.
The ventilation system turns off as soon as the outside temperature matches the indoor temperature, and when it gets colder at night, the ventilation system turns back on.
After the holiday, last Saturday we had something like 23 degrees.
When we are home, we also ventilate at night. This year it cools down very well at night.
Nutshell schrieb:
Don’t believe everything.
No one here has recorded 20 degrees after weeks of drought, sun, and clear skies… except at 3 a.m. at an open window. Although we live in the driest part of Bavaria in 2022 (we didn’t need that record), it is not the warmest area. This year, the outdoor temperatures only failed to drop below 20°C (68°F) once or twice. That allows for cooling at night. If you don’t let the heat into the house, as @motorradsilke does, you just need to get rid of the heat generated inside.
M
motorradsilke1 Sep 2022 06:48haydee schrieb:
We live in the driest part of Bavaria in 2022 (which was an unwanted record), but it’s not the warmest area. The outdoor temperatures this year only fell below 20°C (68°F) once or twice. This allows for cooling down at night. If you prevent heat from entering the house as @motorradsilke does, you only need to get rid of the heat generated inside. But then you have to keep everything closed all the time. That’s not how we want to live. However, since here too there were only two nights this year with temperatures just above 20°C (68°F), we can easily get rid of the heat that does get inside. 😉
M
motorradsilke1 Sep 2022 07:18haydee schrieb:
@motorradsilke
No. The patio door facing north is open when we are there. People go in and out after all.
The roller shutters are only closed where and as much as necessary. So it’s not a dark cave.But with the patio door open, you also let heat into the house. Not as much as on the south side, but the air on the north side isn’t colder either when it’s 30°C (86°F) outside.Similar topics