a/c unit replacements

[Sid Naik]

We are having constant a/c unit replacements in my 15 unit multifamily . 

Not sure if property management is taking me for a ride . Should I manage A/c units through a regular a/C vendor instead of property management ? Is there such a thing of contracting out A/c maintenance needs so that they are not replaced every month . I don't even know if the property management is even looking into diagnosing the issue instead of plain replacement . Any ideas friends ?