for this job, I did a cooling tuneup. when I arrived, thermostat was set to 74 and house was at 77. Took a Delta and it was 10. Drains were clear. Let the homeowner know I had to do an evaluation and find the immediate source of the problem. at the outdoor unit, I noticed an issue with refrigerant. Started checking the compressor and reversing valves and found that the compressor was not compressing the refrigerant even though it’s running. Diagnosed as a mechanical failure with compressor. homeowner said they need time to think about repair or replacement.