<HTML><BODY><p>Dear all,<br><br>Sorry for this question. How can I calculate total heating demand of the building. I swiched on heating and cooling in zones. Then I get output numbers with positive numbers between 0-8h and negative 9-18h then positive 19-24. Should I sum up all this numbers? And why numbers positive and negative I haven't put schedule?<br><br>Thanks in Advance <br>Aika <br></p></BODY></HTML>