Wozer

my guess is that this is related to the compressor which is probably starting to seize up and the load is tripping the breaker...agreed that he needs a professional, and one that comes with good recommendations as their are many that will charge for work not needed....and you may indeed be correct in that it may be the breaker that is starting to fail and that is what can't handle the load. either way, a professional is needed as a homeowner (unless experienced) should not be changing out breakers!