Hello everyone,
We have now been living in our house for six months (KfW 55 standard, although the heating demand is closer to KfW 40) and are really impressed with the indoor climate and comfort provided by the underfloor heating (operated by an air-to-water heat pump). The underfloor heating works flawlessly for us and seems well adjusted, at least the energy consumption is reasonable and the indoor temperatures are almost always comfortable. We don’t have a central or decentralized ventilation system; we ventilate traditionally by opening windows. So far, so good.
The only "problem" is the bedroom (about 17sqm (183 sq ft)): it faces northwest and is not directly heated (the flow temperature is set to zero), because even with the door closed it already gets “too warm.” The temperature in the house is around 21–22°C (70–72°F), which is our preferred indoor temperature. However, in the bedroom, we would like only 16–17°C (61–63°F), since 20°C (68°F) makes the bedding unnecessary 😀 But we simply cannot achieve this… Usually, we ventilate by opening windows crosswise for about an hour before going to bed, which lowers the temperature to around 13–14°C (55–57°F) — actually already too cold — but it quickly rises again and reaches nearly 20°C (68°F) in the morning. This causes waking up at night sweating and almost not needing the blanket. Not very restful… 🤨
Sleeping with the windows open is unfortunately not an option since we need complete darkness and absolute quiet.
How do you handle this? Is it something you just have to accept in extremely well-insulated houses, or how do you get the bedroom cooler? I can’t imagine all new-build homeowners comfortably sleeping at 20°C (68°F), as this doesn’t match the general recommendation for the [oB]optimal sleep temperature[/oB] for adults, which is between 15°C and 18°C (59–64°F).
Thanks in advance!
We have now been living in our house for six months (KfW 55 standard, although the heating demand is closer to KfW 40) and are really impressed with the indoor climate and comfort provided by the underfloor heating (operated by an air-to-water heat pump). The underfloor heating works flawlessly for us and seems well adjusted, at least the energy consumption is reasonable and the indoor temperatures are almost always comfortable. We don’t have a central or decentralized ventilation system; we ventilate traditionally by opening windows. So far, so good.
The only "problem" is the bedroom (about 17sqm (183 sq ft)): it faces northwest and is not directly heated (the flow temperature is set to zero), because even with the door closed it already gets “too warm.” The temperature in the house is around 21–22°C (70–72°F), which is our preferred indoor temperature. However, in the bedroom, we would like only 16–17°C (61–63°F), since 20°C (68°F) makes the bedding unnecessary 😀 But we simply cannot achieve this… Usually, we ventilate by opening windows crosswise for about an hour before going to bed, which lowers the temperature to around 13–14°C (55–57°F) — actually already too cold — but it quickly rises again and reaches nearly 20°C (68°F) in the morning. This causes waking up at night sweating and almost not needing the blanket. Not very restful… 🤨
Sleeping with the windows open is unfortunately not an option since we need complete darkness and absolute quiet.
How do you handle this? Is it something you just have to accept in extremely well-insulated houses, or how do you get the bedroom cooler? I can’t imagine all new-build homeowners comfortably sleeping at 20°C (68°F), as this doesn’t match the general recommendation for the [oB]optimal sleep temperature[/oB] for adults, which is between 15°C and 18°C (59–64°F).
Thanks in advance!
SumsumBiene16 Jan 2021 09:25Window open, earplugs in, and sleep mask on?
Joedreck schrieb:
It’s simply the case that temperatures inside the house tend to equalize. The houses are very well insulated, so the surrounding rooms help warm the bedroom. Otherwise, you would eventually have the outdoor temperature in the bedroom.
I’m probably different from most people here. Even in summer, I need something cozy, and at 20°C (68°F) in the bedroom, I feel completely comfortable with a regular blanket. It could actually be thicker. I mean the blanket. Not me. 🙂But you can still easily achieve a 2 to 3-degree difference in a KFW house. You just need to find a compromise and slightly lower the temperature in the other rooms.It works like this for us as well. The bedroom is just under 18°C (64°F). Other rooms on the same floor are at 21°C (70°F), and the bathroom is at 22°C (72°F). The bedroom radiator is completely turned off. The bedroom door is closed during the day and open at night. This is in a KfW40 timber frame house.
Bookstar schrieb:
However, you can still achieve a 2 to 3 degree difference in a KFW house without any problems. You just have to find a compromise and slightly lower the temperature in the other rooms. Alright, OK. I hadn’t assumed that. Then it is of course possible.
Bookstar schrieb:
It could also be that the heating loops for the other rooms run through the bedroom? Where is the manifold located? Unfortunately, this is sometimes done incorrectly. That would be really bad. Good point, thanks. That is actually the case. The "supply line" for the manifold on the upper floor runs right across the bedroom. But it’s under the insulation for the screed and, from a floor plan perspective, it wouldn’t have been possible otherwise. I need to measure whether the floor is warmer there than in other parts of the bedroom. That would at least be a small explanation:
T_im_Norden schrieb:
Regarding the discoloration of the sight glasses, do you have a towel radiator connected to the heating circuit? No, we don’t. There will probably be an electric towel rail in the bathroom, but not until next winter 😉
I will experiment a bit with the temperatures of the other rooms on the upper floor; maybe that will help a little. The bedroom is also directly adjacent to the bathroom, where the temperature is naturally the highest…
Thanks in any case for all the replies so far. Great!!!
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