CFrance - Don't know if this guy does AC - but his 'shop' would be my first try:
Quality Tire & Brake on 466 just west of 441/27 in Lady Lake
Quality Tire & Brake - Lady Lake, FL | Yelp
The place appears like a used car lot - but that is just because of all the customers Vaughn has!
As the 2011 reference states - the phone is rarely answered and it is best to stop by and discuss your needs. He is closed Fri/Sat/Sun. If this man cannot fix the A/C unit, perhaps he knows and trusts someone he can refer you to.
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Not sure if I have free time...or if I just forgot everything I was supposed to do!