You have a couple of choices at this point. First, I'd suggest hiring a lawyer to assist you because you're going to need one at some point.
Next, since this was an FHA loan then the problems what were supposed to be fixed were likely required before the loan would be approved. Therefore this involves both a potential civil case and a potential federal criminal case.
It also appears to have been a conspiracy in that multiple people were involved so that may bring other statutes, like RICO, into play.
Your decision now is whether you want to keep the house and get it repaired or cancel the loan and get another home. Obviously, it is nearly impossible to live in Tarrant County during August without air conditioner (at least for normal people) and there is a good chance that this will take a while to sort out. That's one reason I suggested you hiring the lawyer right away because at some point you will be able to recover your attorney's fees but the lawyer can help to get you into someplace livable during the remaining hot months or at least until the repairs are made. Without a lawyer everybody is going to be blaming everyone else and you will be sitting there sweating while they sort out the blame.
I'm not sure what additional questions you have since your only ones were "what do I do" and "what is my recourse" which is the same question.
If your question has been answered then I'd offer my best wishes to you and ask that you please not forget to leave a Positive Rating so I receive credit for my work.
Of course, please feel free to ask any follow up questions in this thread. I want to be sure that all of your questions are answered. In addition, once you issue your Positive Rating the question will lock open and no longer time out so you can come back to it anytime in the future if you think of any follow ups.