Heating circuits/thermostats for living/dining/kitchen with underfloor heating/heat pump

Temperatures in toddlers can be debated...

Since we have experienced that most toddlers kick off their blankets anyway (which 2.5-year-old still wants to sleep in a sleeping bag?), cool bedrooms make little sense in my opinion. At 18 degrees in the children's bedrooms, we wouldn't even need them, as we would have a subscription with the pediatrician directly. Why should these temperatures actually be too high?

With infants, people say things like that, but I also consider it exaggerated - what are people supposed to do in attic apartments?

With the first child, I still lived in my apartment for 1 year, where we still had central heating, gas heating, and hardly any insulation – and in the bedroom, the temperature was 16 to 17 degrees for most of the year (even cooler than other rooms in summer, as it’s on the ground floor of the house built into the slope) and the little one wasn’t even once cold or sick during that year. So it’s not harmful. Our second child in the house with a warmer bedroom was already cold; but there are also more possibilities for infections. For a reliable study, your own children are not enough... But in our house, we don’t get large temperature differences either.

So, in my opinion, the absolute biggest nonsense is to plan 3!!! thermostats for one room. How are you supposed to separate the air in one room? We also have a "large" room of just under 60m² living-dining area and open kitchen and have installed a total of 6 circuits and 1 thermostat here. That, I have to say, works quite well too, at 28° flow temperature @ 0° outside I reach a maximum of approx. 24 degrees in the room. If I turn the thermostat down, I can also easily lower the large room to 20 degrees. It is probably more difficult the other way around. If the living-dining room is set to 24 degrees, the small hallway is then also heated and the temperature does not drop noticeably, even if I try to turn it down here. I would definitely install thermostats (whether you use them later is up to you, but it doesn't cost the earth) and usually carry out a heating circuit not larger than 10m² / 120m length. The closer the heating pipe lies, the more economical the heating supposedly is, so don't save a few euros here.

- what are people in attic apartments supposed to do?

And the hundreds of millions of people who live in the tropics.

Or is sleeping at 21-22 degrees harmful only for Germans?

And the hundreds of millions of people living in the tropics.

Or is sleeping at 21-22 degrees only harmful for Germans?

I once read that it is not the higher temperature that causes poor sleep, but oxygen deficiency, for example, if you keep the window closed. In this case, a controlled residential ventilation system is worth its weight in gold. The comparison with the tropics is a bit misleading since in the warmer countries air conditioners are often installed. Otherwise, if it is too warm, you do sleep worse. However, for example, in Australia, I set the air conditioner to 27° and that was pleasant, especially coming from outside, also for sleeping. If it had been set any lower, it probably would have resulted in a nice flu...