Similar to the operation of a car, the building also has its "useful life" or life cycle, which must be closely followed and invested in renovation at various stages, which guarantees not only the improvement of the energy efficiency of the building but also its safe operation. My experience shows that residents often think about renovation only when there are some serious problems with the technical condition of the building, so I urge you to pay attention to the maintenance of the house and act in time instead of waiting for the moment when the balcony falls.