Whose responsibility is it that the air conditioner leaks downstairs?

Legal analysis: it needs to be handled according to the cause of water leakage. If it is a problem in the process of air conditioning installation, it should be handled by the contractor. If not, you should ask the property for compensation.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 942 A realty service provider shall, in accordance with the agreement and the nature of the use of the property, properly repair, maintain, clean, afforest and manage some owners in the realty service area, maintain the basic order of the realty service area, and take reasonable measures to protect the personal and property safety of the owners. Property service providers shall take timely and reasonable measures to stop acts that violate laws and regulations such as public security, environmental protection and fire protection in the property service area, report to the relevant administrative departments and assist in handling them.

Article 943 A realty service provider shall regularly disclose the owner's service items, responsible personnel, quality requirements, charging items, charging standards, performance, use of maintenance funds, and part of the operation and income in a reasonable way, and report to the owners' meeting and the owners' committee.