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Your Complete Annual Air Conditioner Maintenance Checklist

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An efficiently running air conditioner is more than just a luxury; it’s necessary, especially during sweltering summer. Regular maintenance ensures reliable performance, extends your unit’s lifespan, and reduces energy costs. Whether handling it yourself or hiring a professional, this checklist will keep your cooling system in peak condition year-round.


What You Should Know About Annual Air Conditioner Maintenance

Check and Replace Air Filters

Dirty air filters can obstruct airflow, reduce efficiency, and strain your system. Inspect your filters every 1-3 months, especially during peak usage. If the filter appears dusty or clogged, replace it immediately to maintain air quality and energy efficiency.

Clean the Evaporator and Condenser Coils

Over time, indoor and outdoor coils accumulate dirt, reducing the unit’s ability to absorb heat. Turn off the power, remove debris, and gently clean the coils with a soft brush. You can also use a coil cleaner solution to remove tougher grime.

Inspect the Thermostat Settings

Ensure your thermostat maintains your desired temperature efficiently. If you have a programmable thermostat, set it according to your schedule for optimal energy savings. If your thermostat is outdated, consider upgrading to a smart model for better control and efficiency.

Clear Debris from the Outdoor Unit

Leaves, dirt, and other debris often collect around the outdoor condenser unit, reducing airflow. Remove any visible debris around the unit, trim surrounding vegetation, and ensure at least two feet of clear space for proper airflow.

Inspect Electrical Connections

Loose or damaged electrical connections can affect the unit’s performance and pose safety hazards. Check for frayed wires, burnt terminals, or loose connections, and tighten or replace components as needed. It’s best to call a licensed HVAC technician for a thorough inspection.

Lubricate Moving Parts

Lubrication reduces friction in the motor and other moving components, ensuring smoother operation and less wear and tear. To maintain optimal performance, be sure to use non-detergent motor oil or lubricant recommended by your manufacturer.

Check the Condensate Drain Line

The condensate drain line removes moisture collected from your indoor air. Over time, it can become clogged with mold, algae, or debris, leading to water damage or increased humidity indoors. Use a wet/dry vacuum to clear blockages and ensure proper drainage.

Inspect the Fan Blades

The fan blades are crucial for proper airflow and cooling efficiency. Turn off the unit and visually inspect the blades for signs of wear, cracks, or dirt buildup. Clean the blades carefully with a soft cloth or vacuum brush attachment. Damaged blades should be replaced to prevent operational issues.

Monitor Refrigerant Levels

Low refrigerant levels often indicate a leak, which reduces cooling capacity and can damage the compressor. If you suspect low levels, contact a licensed HVAC professional to recharge the system and repair any leaks. Handling refrigerants requires proper training and certification.

Check the Blower Motor and Belt

The blower motor drives the airflow throughout your home, and a worn-out belt can reduce airflow and efficiency. Check the belt for wear, tension, and alignment and replace it if necessary. Clean the blower motor with a soft brush to remove accumulated dust or debris.

Test the Safety Controls

Safety controls prevent the system from overheating or operating in unsafe conditions. Test each control feature, such as pressure and thermostat limit switches, to ensure they function correctly. Any inconsistencies may require professional servicing.

Inspect and Seal Ductwork

Leaky ducts can significantly impact energy efficiency, leading to higher energy bills and uneven cooling. Inspect ducts for visible gaps or tears and use duct tape or sealant to cover any leaks. Proper insulation in ducts can also improve cooling performance and energy savings.

Review Energy Usage

Monitor your energy bills and system performance. If energy usage spikes unexpectedly, it may be time for a professional inspection to identify inefficiencies or worn components.


Stay Consistent with Maintenance

Routine air conditioner maintenance ensures a comfortable home environment and minimizes unexpected repair costs. Follow this annual checklist to maintain optimal efficiency, extend the unit’s lifespan, and enjoy consistent cooling throughout the year. If you encounter complex issues or are unsure about specific tasks, always consult an HVAC professional.

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JP Reyes

JP has been in the aircon industry for almost as long as he has been alive. As a child JP would help his tatay fix aircon units at their junk shop in Cavite. After graduating UP in the early 2000's, JP then started his own Aircon servicing business and within 5 years had 10 shops in 8 different cities. Fast forward to today and JP brings all his experience and expertise online to give readers trustworthy advice and reviews about Air-conditioning buying, servicing, cleaning and repair in the Philippines.

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