The monthly fee is determined according to the heating need and output in the customer’s property and the dimensioning of the heating system. These are affected by, e.g. the building volume, year of construction, connection methods of the heating circuit, and the number of floors in the property. The number of apartments and the basis of maintenance charge distribution have an impact on the distribution of the monthly fee between the shareholders – the more apartments there are, the smaller the apartment-specific monthly fee is. The monthly fee is tied to the Consumer Price Index. The customer is notified of the changes in the Consumer Price Index each year in connection with the bill.