Age of AC Unit?
Don't clean the coil in place. Have it removed to clean. That's the only way to really clean it and get max efficiency. All the suggestions are good ones including the UV light. Is there a lot of construction that had been going on at sometime nearby? Lots of dust in the air? Do you change filters regularly? Monthly? Do you have a service contract? Are you here full time? All important factors to consider. I would think $600-$650 if no other factors.
South Florida Resident for 68 years.
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