What are you paying the cooling system person to do? Cleaning the evaporator coil and the condenser coil (outside unit) should be part of a regular maintenance service which should cost less than $100 to check out the entire system. But, if you have been replacing your filter regularly, the evaporator coil shouldn't need to be cleaned. Personally, I never hire an HVAC company unless the system fails. I change the filters and pour vinegar down the condensate drain line to prevent it from clogging. Those are very easy things to do yourself. An HVAC company really cannot do anything on a regular basis that will prevent your system from failing. But, $300 is way too high to clean the coil.
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