Is the heating fee in Daqing calculated according to the building area or the usable area?

According to the construction area, if it is the housing reform of the Administration Bureau, it is also called welfare housing distribution (referring to the house previously allocated to employees by the unit, in order to reduce the burden on employees, the property certificate is the use area, excluding the shared area of the balcony and corridor on the same floor), so the charge is 10 square meters. If it is a high-rise pool and elevator, this certificate authority will have it in 2003, and now the property certificate handled by the developer is also the construction area.