The service man was great at explaining and diagnosing the problem. This home was built in 10/2017. And the ac compressor never worked. I just thought the unit was underpowered. After my electric bill keeps going up I call the very people who installed the system to take a look at it. After few moments the service man finds it was a loose wire in the thermostat. Yes it was out of warranty but they the original installers made that poor connection. Should I have to eat the whole cost?