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How to Clean an Air Conditioner

Valerie Albarda

By Valerie Albarda
Updated March 11, 2025

A clean air conditioner is a healthy air conditioner. We're here to teach you how to clean window A/C units and central A/C units.

Skill

Beginner

Time

Few Hours

Tools and Materials

Note
Product costs, availability and item numbers may vary online or by market.

Getting Your Air Conditioner Prepared for the Season

When the outside temperatures begin to heat up, it’s good to know you can retreat indoors to the welcoming cool of an air-conditioner. However, with your A/C sitting dormant outside or stored away during the winter, it may have accumulated dirt, dust and debris, potentially clogging the filter and reducing airflow. Before you crank it up at the first sign of a hot day, follow these steps for a clean A/C unit.

How to Clean a Window A/C Unit

Follow these general steps to clean your window A/C unit. Be sure to follow the manufacturer's instructions.

How to Clean an Air Conditioner: Window A/C

How to Clean an Outside A/C Unit

Hiring someone to clean your outside central A/C is costly and time-consuming. Check out the six steps below to see how you can efficiently clean an outside central A/C yourself.

How to Clean an Air Conditioner: Outside A/C

Tips to Keep Your A/C Unit Maintained

Below are a few tips to keep your A/C unit maintained year-round.

  • Change the air filter on a regular basis, every one to two months, to reduce allergens and allow good airflow.
  • Check the measurement of the filter so you get the correct replacement size.
  • Check the vents and make sure there’s nothing blocking the airflow. This helps cool your home more efficiently.
  • Deep-clean the condenser unit once a year.
  • A/C units run more efficiently in the shade, so consider planting bushes that don’t shed leaves to provide a cool spot for the unit to do its job.
  • For proper airflow, remove foliage, bushes, furniture, etc., and keep at least a 2- to 3-foot clearance around an outdoor A/C unit. Obstructions may affect the performance of the air conditioner and cause it to work harder.
  • Inspect the unit for loose or damaged electrical connections.
  • In the off season, cover the unit with a breathable cover.