Babies and toddlers get sick a lot more than grown ups, as their immune system is not fully developed yet. Therefore the nursery should have a comfortable average temperature, that at the same time is not very different to the room temperature we adults prefer, although you may want to provide your child with an extra layer of clothes.
If you have a newborn baby in your household, keep in mind that the baby should never get too hot, so you should prevent overheating in any case.
It is advisable to keep an eye on the room temperature as your baby can’t tell you how it is feeling. With tado° you always have control over the room temperature and know if it is too hot or too cold.