Arrived in Elgin for AC Maintenance, Today I arrived and met with Reed. C/s when he came home yesterday between 3-4 pm the indoor temperature was 81 and set for 72, he removed the air handler panel and shortly noticed it was frosting over. Not too sure if the outdoor unit was on or off at that time. Also mentioned that they attempted to turn it on later in the evening and it began frosting within 5 minutes. I investigated concerns, I found indoor system has a fixed metering device and a 4 ton straight cool outdoor, I checked pressures and found them to be high possibly overcharged however when comparing data to the chart on outdoor unit I found it was within range + - 15psi. With that being said I allowed system to operate in cooling mode for the duration of my visit checking pressures continually, pressures never reached freezing nor did it get close to HPCO