Summary of the most important maintenance costs and intervals.
|Position||Activity||Interval||Today's costs (net)||Unit|
|Exterior wall||Maintenance||Annually||1.5% of Invest||€/a|
|Floor construction||Maintenance||Annually||1.5% of Invest||€/a|
|Flat roof construction||Maintenance||Annually||1.5% of Invest||€/a|
|Windows and doors||Maintenance||Annually||1.5% of Invest||€/a|
|Ventilation system with heat recovery||Maintenance||Annually||4.0% of Invest||€/a|
|Air distribution system||Cleaning and maintenance||Annually||6.0% of Invest||€/a|
|District heating transfer station||Maintenance||Annually||3.0% of Invest||€/a|
|Ground source heat pump||Maintenance||Annually||3.0% of Invest||€/a|
|Air heat pump||Maintenance||Annually||3.0% of Invest||€/a|
|Thermal collectors||Maintenance||Annually||1.0% of Invest||€/a|
|PV system||Maintenance||Annually||1.0% of Invest||€/a|
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