• Can you find the make/model for your unit and google for the owner's manual? The owner's manual will have the recommended servicing. Depending on use, the air filter will need to be changed regularly (1 to 3 months). If you have a reusable, you have clean it based on manufacture directions.. In the past, I've usually called A/C repairman when needed (12 to 18 months) year to check coolant. My unit was old and was just replaced.

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