From a lease perspective the landlord has the duty to maintain the premises, unless the parties contract differently. So for example, while a landlord need not install an air conditioner (as opposed to heating-which goes to habitability and is the landlord's express responsibility), if one came with the property and it was functioning, then the landlord must maintain it.
From a purchase perspective, one can make the contract as is, so the buyer would be responsible for the air conditioning repair; however, the lease is what is controlling since the real estate contract has not yet taken effect.
A reasonable time frame for repair is generally a week or possibly two (depending on the availability of a repairman)
One can discuss how since the air conditioning unit broke during the tenancy, the landlord is obligated to repair it.
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Information provided is for educational purposes only. Consultation with a personal attorney is always recommended so your particular facts may be considered. Thank you and take care.