ᐅ Air-to-Water Heat Pump: Current Consumption and Data

Tilting the windows open for 10 minutes is not enough; we ventilate by opening the casement windows fully for cross-ventilation.

Cool, some people struggle with too much humidity, and I actually feel happy when the bathroom humidity rises to 70% and stays like that for 30 minutes.

My problem is more that all the rooms are too dry.

tomtom79 schrieb:

Cool, some people are struggling with too much humidity, and I’m happy when the bathroom humidity rises to 70% for 30 minutes.

My problem is that all the rooms are too dry.

Dry eyes are an individual issue with controlled ventilation systems and the like. Humidity levels in rooms and their consequences are a different matter entirely.

Basically, I don’t find 60% humidity problematic. It’s not commonly seen as harmful and is generally considered the upper limit for a still healthy indoor climate. I only notice a damp smell above 65% (and even then only after longer periods).

Regarding the problem:
The easiest solution is to buy an electric dehumidifier for around 150€ (about $160) from Amazon, like a Comfee model, and run it for a week. After that, use it only as needed. For me, the device runs every 2-3 days for 6 hours in the basement storage room, depending on the weather. I bought it last winter and ran it continuously for about a month at first. After 12 hours the unit was full (3 liters (0.8 gallons)).

halmi schrieb:

I think the problem is simply that there isn’t proper ventilation.

Open the windows 3-4 times a day and create a draft. You need cold air to absorb the moisture. If you only reduce the temperature from about 23.5°C (74°F) to 21.5°C (71°F) by ventilating, it hardly makes any difference.

Why does that hardly help?
I also don’t believe there’s any leak. You would notice that somewhere on the ceiling of the ground floor or at the joints, which would have to be constantly damp...
What I notice is that when my wife showers, and she only uses the handheld showerhead, the humidity does not rise nearly as much as it does when I shower with the rain showerhead.

Are you serious? Humidity is always relative to the temperature. Cold air can hold much less moisture than air at 22°C (72°F). And then, by ventilating again, you can get rid of the moisture. Even if the air at both 5°C (41°F) and 23°C (73°F) has 60% humidity.

The explanation is reversed; cold air can obviously hold less moisture, which is why the air is always so dry in winter. However, the effect is still the same. Letting cold winter air in from outside (with low absolute humidity) warms up inside and absorbs moisture from the interior air, which is then carried out again when ventilating. This is why cross-ventilation is so important.