My ac stopped worked so I called John Moore and a ...

My ac stopped worked so I called John Moore and a technician was scheduled for the next day. The technician arrived, took the panel off the outside ac unit and said that the compressor was overheating causing the cut off to activate. He said I needed a whole new unit (he checked nothing else apart from putting a meter on). He then went into my attic, checked around and said I had 2 choices, a complete replacement (unit, ducts, collars, furnace @ over $16000 or the same without changing the furnace @ over $13000. He immediately had his financial person call me but my credit wasn't good enough so he left. Before he left though he told me that if the unit overheats it will take several hours for it to cool down before I can reset it.
Sure enough, that afternoon it tripped again but within 10 minutes I had it running again so I called in a second opinion.
Another AC guy came over late that evening and found that the only problem was that the outside unit was so dirty that it was stopping airflow causing the unit to seriously overheat. He also said that the cutoff switch wasn't directly connected to the compressor so the compressor heat would not cause the cutoff to trip. He said that the John Moore guys was talking BS.
He spent 20 minutes with a hose cleaning the side vents on the unit and immediately the unit cooled down and inside the house the temperature difference was almost immediate.
He then checked the rest of the unit and found that the dirt was the only problem.
So he charged me $134 for a 8pm Friday night callout and fix.
He asked me if the John Moore technician had said about the dirt and I said no, as he had not even mentioned it.
He said that he came across John Moore doing the same scam all the time and while we were speaking he received a call from a 70 yr old woman who had just been told the same thing from John moore.
With all their adverts they come across as a company who had high moral values when in reality they want to get as much money from you as possible regardless of what you actually need.
Outcome of this story, get a second opinion after getting a quote from John Moore (or don't even use them) plus wash all the dirt from the sides of your unit 2 or 3 times per year (the sides are like a car radiator and you want those metal fins as clean as possible).
To say I'm disappointed with John Moore is an understatement and I will tell everyone from now on to avoid them like the plague.