Secondly, I have documented violations of the lease prior to them moving out.

The issue with a rent back is that you have to draft and put a lease in place. 

It means AirBnB has become a dirty word because people do things like get a lease on an apartment in a large apartment building in NYC and “AirBnB” it until they get caught then they get booted and they find another building and do it again. 

I would have the landlord check the lease to see if there is any language giving  the right to show the property while the tenant is still occupying the property.

The ac guy is supposed to come out in 4 days and they said since ac is in their lease they will not be turning the ac off.

Now is definitely the worst time to try and lease out a house with no AC.

We plan to leverage the Bigger Pockets Lease agreement. 

I read subletting was mentioned in the lease, I'm not exactly familiar with all of this renting/lease jargon, or how that would work, or if it's even an available option, I'm just in a desperate situation at this point.

I usually require a 2 year lease.

I have a pretty tight lease and my son lives in the house, so what would an experienced landlord here do?