Comfort First Heating and Cooling

We got assigned this vendor through American Home Shield on June 7. Our AC unit was not holding 79 degrees in our upper floor. The tech came 5 days later and diagnosed a leak in the evaporator coil. They replaced it one week later ($3.5k). The following day, the unit was functioning worse than prior to the installation not holding 80 degrees in any of the floors. We called and came again 3 days later. One would expect they would come earlier as it was a follow up. They told us they need it to re-adjust the temperature of the compressor, apparently (they told us) this is common after coil replacement (why this was not done first? no idea!). One day after the visit, the unit still cannot hold 80 degrees in both floors. It is obvious the tech has no idea of what he is doing. At this point I am not sure the initial diagnosis and replacement of the coil (with the consequent fees of adding new refrigerant, $1800 + hand labor+ modifications, all not covered by AHS) was correct. Extremely frustrated experience. I would not recommend this vendor.