How to Clean Your Condenser Coils (Outside Unit)

Tools Needed

• Garden hose (low pressure)

• Coil cleaner (optional)

• Screwdriver or nut driver

• Soft brush

• Gloves

1. Turn Off the Power

• Turn off the unit at the disconnect box near the condenser.

• Also switch off the breaker inside your panel.

2. Remove the Top or Side Panels

• Remove screws holding the fan guard or side panels.

• Lift the fan assembly carefully (do not pull on wires).

3. Clear Out Debris

• Remove leaves, dirt, and grass clippings from inside the unit.

• Use a brush to gently sweep debris off the fins.

4. Clean the Coils

Option 1: Water Only

• Rinse from the inside outward, pushing dirt out of the fins.

• Use LOW pressure—don’t bend fins.

Option 2: Foam Coil Cleaner

• Spray foam on the outside of the coils.

• Let it sit 10 minutes.

• Rinse lightly with a hose.

5. Straighten Bent Fins (Optional)

• Use a fin comb to straighten any crushed fins.

6. Reassembly

• Reinstall the fan and panels.

• Restore power.

How to Clean Your Evaporator Coils (Inside Unit)

Tools Needed

• Screwdriver

• Soft brush

• No-rinse coil cleaner

• Flashlight

• Vacuum (optional)

1. Turn Off the HVAC System

• Shut off furnace/air handler at the breaker.

2. Access the Evaporator Coils

• Open the air handler door or remove the evaporator coil panel.

• You’ll see A-shaped coils or a slab coil.

3. Remove Dust and Debris

• Use a soft brush or vacuum with a brush attachment.

• Be gentle—coil fins bend easily.

4. Apply Coil Cleaner

• Use a no-rinse foaming HVAC evaporator cleaner.

• Spray on all visible coil surfaces.

• The foam will break down and drip into the condensate pan.

5. Clean the Condensate Pan & Drain

• Clear any sludge or mold in the drain pan.

• Pour a cup of white vinegar down the drain line to prevent clogs.

6. Close Up the System

• Reinstall the panels.

• Restore power.

⭐ Tips to Keep Coils Clean Longer

• Change air filters every 1–3 months.

• Keep shrubs/grass at least 2 feet away from the condenser.

• Rinse the outside unit once per season.