Send a 7 day letter to cure or you will withhold rent. Send the letter certified mail return receipt requested. give 7 days after receipt of the letter to fix.
You may be able to get the landlord to agree that you will fix the A/C and deduct it from the rent. Get it in writing and signed by both parties.
Read section 83.51 Florida statutes. You can do the seven day process above and then withhold rent. You can also move to a place with a better landlord. I suggest moving so you are not dealing with this landlord and his troubles in the future.
Mr. Warrick is licensed to practice law in Florida and Alabama. This response is not legal advice and responing to your question does not create an attorney/client relationship or any future obligation. The response is in the form of legal education and is intended to provide general information about the matter within the question. Oftentimes the question does not include significant and important facts and timelines that, if known, could significantly change the reply and make it unsuitable. Mr. Warrick strongly advises the questioner to consult with an local attorney in order to ensure proper advice is received.