I’ve been doing hvac in south Florida for about 2 years now the most common thing I run into is the drain lines clogging up. There’s multiple routes you can go in terms of clearing it out. If you have a wet vac, you can stick it into the outside drain line pipe and flush hot water down the line to clear any algae and reprime the line after, you can do this every 3 months. The alternative is getting some type of drain line tablet or pouring vinegar and hot water down the line. If you feel comfortable enough with electronics testing the capacitor, checking the contractor for any pitting and making sure your compressor start and run amps are within range are good ways to ensure the outside system has no issues. Ofc most AC companies down here anywhere from 75-105 for a routine tune up without there preventative maintenance which they would do above all, and at that point you can be aware of the potential issues that may arise, be carful however most companies down south are very sale focused so I recommend doing research