Had a/c serviced earlier this week because unit was severely short cycling. I live in south tx, have a 2 year old 2 story 2400 sq ft home with a 5 ton Carrier a/c. Tech came out and said unit was overcharged by 2 pounds. After he pulled the R-22 his readings were as follows:
Subcool- 11 deg
Wetbulb- 63 deg
Delta temp- 14 deg
Outdoor temp-94 deg / Indoor temp 75 deg
Static pressure- .15
RH inside house- 54 %
After service I noticed run times got somewhat longer. However, I noticed that the air temp out of the registers did not feel very cool. Laser temp reading on closest register was 62 degrees with thermostat set at 76. Tech said unit was charged precisely to Carrier specs as far as superheat/subcooling goes. From all the posts I have read you guys like to see a 15-20 delta temp and I'm below that with a 2 year old properly charged system. I had ducts inspected and evaporator coil as well. Both were in good shape. Blower is on med speed which reads out to 440 cfm per ton (2200 cfm) according to Carrier chart. If I lower blower to low speed it lowers cfm to 380 Cfm per ton (1900 Cfm). Can I lower the blower speed to bring up delta temp without freezing up the coil? Would I need to get the charge readjusted?
I appreciate any advice.