The school air conditioner is broken, regardless of the property.

1. The air conditioner in the leased office is broken, so the property has no obligation to maintain it for free.

2. Article 2 of the Regulations on Property Management stipulates: "Property management as mentioned in these Regulations refers to the activities that the owners employ property service enterprises, and the owners and the property service enterprises carry out maintenance, conservation and management of the houses, supporting facilities and related sites in accordance with the property service contract, so as to maintain the environmental sanitation and related order in the property management area." It can be seen that the property management unit manages and provides services to the whole property, not to the private property of a specific owner in the whole property.

3. Article 220 of the Contract Law stipulates: "The lessor shall perform the maintenance obligations of the lease item, unless otherwise agreed by the parties." The office, including air conditioning, is rented together. Therefore, unless otherwise agreed by both parties, the lessor shall perform the maintenance obligations. This also shows that the property management unit has no obligation to repair the air conditioner in the office.