Hello everyone
I have a question about heating during “high daytime temperatures in autumn.”
I am the landlord of a granny flat (an extension to the house, partially basement level, on the ground floor). The flat accounts for about 20% of the entire house. The relatively large heating system for the whole house is a ground source heat pump. The house is well insulated and has new windows.
My tenant is complaining about high humidity in the flat and wants me to turn on the heating or adjust the heating settings. Since I don’t have these issues in the main house (humidity is usually between 45-60%), I suspect that my tenant is simply not ventilating properly.
On the morning of September 20, the humidity in the rental flat was 74% at a temperature of 20.2°C (68.4°F) (the maximum 24-hour indoor temperature was 22.2°C (72°F)).
The weather during this time was as follows:
September 19: max temperature 22°C (72°F), min 13°C (55°F) / outside relative humidity daytime 50%, nighttime 90%
September 20: max temperature 24°C (75°F), min 12°C (54°F) / outside relative humidity daytime 50%, nighttime 90%
September 21: max temperature 24°C (75°F), min 14°C (57°F)
September 22: max temperature 16°C (61°F), min 11°C (52°F) -> the heating switched on automatically at the latest here
I assume that the heating did not operate (or only briefly) from September 19–21, because daytime temperatures were well above 20°C (68°F) and the return temperature rose quickly.
Since the outside air humidity was around 50% during the day, I believe the tenant could reduce indoor humidity simply by ventilating properly during the day, making use of the heating unnecessary and not cost-effective. Is my assumption correct?
Thank you for your answers.
I have a question about heating during “high daytime temperatures in autumn.”
I am the landlord of a granny flat (an extension to the house, partially basement level, on the ground floor). The flat accounts for about 20% of the entire house. The relatively large heating system for the whole house is a ground source heat pump. The house is well insulated and has new windows.
My tenant is complaining about high humidity in the flat and wants me to turn on the heating or adjust the heating settings. Since I don’t have these issues in the main house (humidity is usually between 45-60%), I suspect that my tenant is simply not ventilating properly.
On the morning of September 20, the humidity in the rental flat was 74% at a temperature of 20.2°C (68.4°F) (the maximum 24-hour indoor temperature was 22.2°C (72°F)).
The weather during this time was as follows:
September 19: max temperature 22°C (72°F), min 13°C (55°F) / outside relative humidity daytime 50%, nighttime 90%
September 20: max temperature 24°C (75°F), min 12°C (54°F) / outside relative humidity daytime 50%, nighttime 90%
September 21: max temperature 24°C (75°F), min 14°C (57°F)
September 22: max temperature 16°C (61°F), min 11°C (52°F) -> the heating switched on automatically at the latest here
I assume that the heating did not operate (or only briefly) from September 19–21, because daytime temperatures were well above 20°C (68°F) and the return temperature rose quickly.
Since the outside air humidity was around 50% during the day, I believe the tenant could reduce indoor humidity simply by ventilating properly during the day, making use of the heating unnecessary and not cost-effective. Is my assumption correct?
Thank you for your answers.
H
HeimatBauer19 Oct 2023 10:34First of all: Yes, I have read that the primary request was about heating. In my opinion, the issue lies elsewhere, namely with ventilation.
As a former landlord, I can say: Any detailed and physically sound guide on proper ventilation is as effective as a fart in a hurricane.
What I have debated, pleaded, demonstrated, and documented over the years.
There was exactly ONE solution, and since then, peace has returned: ventilation with differential humidity control. Of course, with frost protection and the usual best practices, obviously. But I made it clear: this is a fan that belongs to the house, nothing is adjusted or blocked, it just runs.
So install a sealed and as unblockable as possible ventilation system with differential humidity control, and the issue is solved.
And if someone still wants to keep their place at 24°C (75°F), they can just use an electric heater.
As a former landlord, I can say: Any detailed and physically sound guide on proper ventilation is as effective as a fart in a hurricane.
What I have debated, pleaded, demonstrated, and documented over the years.
There was exactly ONE solution, and since then, peace has returned: ventilation with differential humidity control. Of course, with frost protection and the usual best practices, obviously. But I made it clear: this is a fan that belongs to the house, nothing is adjusted or blocked, it just runs.
So install a sealed and as unblockable as possible ventilation system with differential humidity control, and the issue is solved.
And if someone still wants to keep their place at 24°C (75°F), they can just use an electric heater.
In der Ruine19 Oct 2023 11:19HeimatBauer schrieb:
So install a sealed and as unblockable as possible ventilation system with differential humidity control, and that issue is solved. What did you install? ... install ... install ... install
H
HeimatBauer19 Oct 2023 11:53That was a long time ago; back then, I hadn’t built anything like this myself yet. I went to the heating/plumbing specialist and said: Do whatever is necessary and send me an invoice. He installed a complete control system, including a fan with an exhaust flap.
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