Generally, Hongye HVAC software is used after the work of HVAC major, which is similar to Tianzheng, including drawing plug-ins and load calculation, covering almost all large, medium and small cities, as shown in the following figure. You can choose from them. And I remember a book with a lot of city data, which seems to be called heating and ventilation. It's not a HVAC design code, it's another book. I found it in the school library at that time for graduation design, but now I really forget the name. I hope I can help you!