I purchased a Trane air conditioner in October of 2019. I had the unit serviced for preventative maintenance in May 2021. This was supposed to be an free service call under the waranty. The service tech said the unit was low on coolant and added some resulting in a charge. In June/July I noticed the unit was running constantly and could not keep the house cooled to the thermostat set temperature. I scheduled another service call on July 20 and was told there was a large hole in the evaporator coil and it needs replaced. How in the world does an evaporator coil have a hole after only 20 months? My electric bill for the month of June was twice the normal amount due to a constantly running unit.