Upon arrival l tech found the thermostat at 90 degrees. I found that filter was dirty. I removed filter and went out to unit. I hooked gauges up to unit and found that unit is low on refrigerant. Unit and line set hold approximately 6-7 lbs of R22. Customer decided that they wanted to wait and talk to their insurance company before getting an estimate. I left card with customer and they said that they would contact us to get an estimate. Unit is low on refrigerant due to leak because of age of unit. Customer does not have a/c at this time.