Experience has show that many residential comfort cooling systems are operating with a refrigeration system over charged. Especially in cases where customers have called to say that their system isn't cooling enough and the technicians response was to connect a set of gauges and add some refrigerant in an effort to solve the problem. Ironically, this is also a problem for some customers who faithfully call for maintenance and start up service at the beginning of each cooling season, only to have the technician make the same basic mistake. Its all about balance when it comes to air flow. We have to assume for now that the size of the unit and the velocity of the air flow is correct. Therefor its a lack of maintenance that affects proper air flow, which is what leads to an improper refrigerant charge. This is often the source of performance complaints. Bottom line clean the coil.
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