On 2014, I have installed a heat pump with Griffith. On 2015, the unit no longer produce cool air in the near summer. So I called Griffith and a technician found that there was no more refrigerant. I told them that I just got the unit installed one year, but they still charged me for the refrigerant refill. On 2016, the unit was out of refrigerant again, but I found out it was a dirty Schrader valve at one of the service port was leaking (Isn't it supposed to be checked for leak when the refrigerant gets filled afterward as a standard procedure?). The valve was changed and it lasted until year 2020 then the compressor gave out. This time I did a ton of research before I called Griffith again and they finally replaced the compressor. After about a week, the unit does not produce cool air again. I found out that the unit Low Pressure Switch was activated and the brazing of the compressor was not done properly which caused the leak. I requested service with Griffith again. The technician brazed the compressor again. As I watched, I noticed that the Nitrogen Pressure Test was not done. When I requested a pressure test with Nitrogen, the technician only did a vacuum on the system and without the proper industry standard. Guess what? On 2021, the refrigerant had leaked again and it was leaked at the same place where it was brazed on the compressor connections. You can see the refrigerant oil all over it. (Can you count how many times the refrigerant gets filled and leaked so far?)