The own funds of HOAs and housing cooperatives are the most frequently used financing schemes for increasing the energy efficiency in their buildings. The source of these funds are:
- Additional contributions from the owners of apartments and non-residential premises for repair and modernisation
- Income of HOAs / housing cooperatives from renting out auxiliary premises of the house
- Advertising placement
- Payments for parking vehicles
- Payment of telecommunication service providers for access to home infrastructure
- Recently, due to the ban on the placement of solar power plants on the ground, private business has shown interest in the roofs of apartment buildings for the installation of solar power plants