Cleaning Tips

How To Clean An Air Conditioner

Learning how to clean an air conditioner can increase its efficiency, prevent breakdowns, and prevent mold, mildew and other allergens from entering the home.

Person holding Lysol Multi Purpose Cleaner with Hydrogen Peroxide towards a kitchen counter

Often, air conditioners, whether they are window units or central air systems, sit for months or years without maintenance. This can subject the machines to moisture, degradation, and that terribly foul smell of mold and mildew that piles up when an air conditioner hasn’t been cleaned for a while.

Follow the steps below to effectively disinfect and clean an air conditioner.

Clean the condenser

Clean the indoor unit

  • With central air systems, a clean air conditioner works best when it also has a new furnace filter. Prevent pollutants and allergens from entering your home by installing a new filter regularly.
  • Vacuum the blower compartment.
  • Clean a clogged condensation drain with a stiff wire or a bleach solution.
Person wiping a kitchen counter in front of a bottle of Lysol Multi Purpose Cleaner with Hydrogen Peroxide

For window units

Knowing how to clean an air conditioner that sits in the window is just as money-saving as cleaning your own central air system.


Apply Lysol® All-Purpose Cleaner to the coils on the back of the unit and scrub with a stiff brush.

Wash the air filter with a disinfecting cleaner like Lysol® Hydrogen Peroxide Multi-Surface Cleaner.


A disinfected, clean air conditioner will allow for a fresher smell, safer environment, and will help your family remain healthy year-round.