When looking at apartment buildings as an investment it is important to understand how the expenses will be shared. Some apartment buildings require that the tenants pay for their own heat where as others include the heat in the cost of rent or split the total cost of heating by the number of tenants in the building. If you are responsible for heating the common areas you must determine the best way to accomplish this while keeping your expenses under control. The best way to control heating costs is to somehow share the heating expenses with the tenants.