Yes, it's a good idea to clean your AC unit yearly to ensure it operates efficiently and prolongs its lifespan. Regular maintenance can help prevent issues and costly repairs down the line.
Start by turning off the power to the unit. For central air conditioning systems, clean or replace the air filter every 1-3 months, depending on usage and filter type. After that, you can clean the exterior of the unit by removing debris like leaves and dirt. Use a soft brush or a vacuum to clean the fins gently, being careful not to bend them.
For the indoor unit, check the evaporator coil and clean it if needed, as dust can accumulate over time. If you're not comfortable with these tasks, or if your system is complex, it's best to hire a licensed HVAC professional. The cost for a professional cleaning typically ranges from $75 to $150, depending on your location and the unit's condition.
As a next step, consider getting 2-3 local quotes on Handyman.com for a thorough inspection and cleaning of your AC unit.
— Assisted answer