Think of the common costs of the operation

-Hot water and electricity consumption:
Was frugal and don't leave water running unnecessarily. Were also frugal with electricity on the property's common areas. Costs for water and electricity paid by the Association.

-Heat Consumption:
Regulate the temperature not in your apartment during the winter by opening Windows or doors.

Building and Planning
Energi Certification  http://www.boverket.se/sv/byggande/energideklaration/