After using them for years i have left them. Last two check up they said I may have a small leak somewhere but they could not find it they said. They would just charge the system back up. This year's last checkup they said the same thing, but unfortunately my warranty ran out a month earlier. I called another company to come out and look at it for a second opinion. They said it was a leak as well, but it was not small because i lost 3lbs of refrigerant. The only thing they told me that was the same as All Cool was the cost of replacing all the copper and condenser coil was not cost effective due to the upcoming new refrigerant changes. I ended up getting a new system with the new company. The new company also pointed out that my old unit was not cleaned which All Cool said they do each time. Also had a capacitor that was bad and he said they should have noticed that as well. All Cool used to be good, but lately I feel they have gotten sloppy...