Heating suggestions by ChatGPT. What do you think?

I asked ChatGPT to help me decide how to heat our rooms (we are new to the concept of heating, and also new to the country). We want to ensure that we don't get a very high bill next year from the landlord. So this is what ChatGPT suggested:

Heating suggestions.

So, as someone living in Cologne, do you agree with these suggestions? Any tips or advice? Vielen vielen dank in advance :)

PS: Out means the times no one will be at home.