Graphs or charts showing the various cost components (preparation, materials, installation, maintenance) and possible savings. Preparation & planning: Planning costs €300-600, free advice and planning at Luftbude. Material costs per building: decentralized 2000-6000 €, central 6000-9000 €. Installation costs per building: Decentralized average €1,500-3,000 (self-assembly possible), central average €2,500-7,000. Maintenance and cleaning: At Luftbude you receive personal support.