I'm guessing this is a state by state issue. In the county we invest in, we spell out in the leases what we will provide and not provide. If a/c is in going in, a/c will have to be there until the tenant goes out.
Also, I amazed how versed tenants can be in lease and eviction laws. The rest of their lives can be complete drama, yet they are Justice Sotomayor's and Scalia's when it comes to their rights.
Also, be glad that you don't have properties in Cook County, IL. Evictions can take up to 6 months and the judges there give new meaning to the concept of judicial activism. One of the many the reasons, I REFUSE to invest in the Chicago area anymore.
It is pretty said that you can't invest in your own backyard because the local governments are so anti small business.