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Installing air conditioning units on building facades is subject to specific regulations and neighbor agreements. While some installations may not require a construction permit, they must comply with urban planning rules and respect common property rights. The placement of outdoor units should consider the building's characteristics and aesthetic aspects. Approval from two-thirds of co-owners is necessary for modifications affecting common areas. Special conditions apply to historical monuments and protected zones, requiring additional permits. Owners are responsible for ensuring that noise and condensate do not disturb neighbors, as legal actions may arise from excessive disturbances.