This greatly increases efficiency, especially during transitional periods, because in new buildings the heating can simply stay off when it is cold outside but still warm inside, and solar gains may occur again during the day.
Yes and no, it is definitely more efficient. However, I didn’t spend so much time calculating the bathrooms only to then adjust the heating curve for the rooms with solar gains.
Our bathrooms are on the north side and only receive a little solar energy above the ventilation’s heat recovery unit. If I were to hang the controller in the living room, I would have a cold bathroom.
So everything is nicely controlled via outdoor temperature and return flow, and I think that’s good. Of course, I could operate the system more efficiently, but then at the expense of comfort.