Oh, boy, can I relate to this pain. We just had to replace the A/C unit in a rental because the next-door neighbor complained that it was too noisy! I admit that it was just as loud as others on the block, but her husband is on the board, so guess who got singled out? We managed to drag it out for a year, primarily because the HOA's standards were so vague that we forced them to clarify their regulations. (The A/C worked fine, just not super quiet.)
During that period, we kept getting quotes. DH found someone who did the job for 30% less than the first few quotes. He and his sons did a great job, so now they will be servicing all of our rentals twice a year.
My point is that getting multiple bids really paid off.
ETA: Yes, we have big, fat reserves for maintenance, but as always, why spend more than you have to?