How to Clean Refrigerator Coils and Why It Matters for Your Fridge's Life

Refrigerator coils collect dust and pet hair, which makes your fridge work harder and run hotter than it should

The coils on your refrigerator—usually located on the back or underneath—are where the heat from inside your fridge gets released to the outside air. When dust, pet hair, and debris build up on these coils, air can't flow through them properly. Your compressor has to run longer and harder to cool your food, which wears out the machine faster and costs more to run. Cleaning the coils every six to twelve months keeps your refrigerator efficient and can add years to its life.

Most people never think about the coils because they're out of sight. But if your fridge is running constantly, making unusual noises, or not cooling as well as it used to, dirty coils are often the culprit. The good news is that cleaning them takes about 20 minutes and requires only a few basic tools you probably already have.

Key Takeaways

• Refrigerator coils sit on the back or bottom of your fridge and release heat; dust on them forces the compressor to work overtime.
• You need to unplug your refrigerator before cleaning to avoid electrical shock and to let the compressor stop running.
• A coil brush or old toothbrush combined with a vacuum removes most dust and debris without damaging the delicate fins.
• Cleaning every six to twelve months prevents your fridge from overheating and extends the life of the machine by several years.
• If your fridge still runs constantly after cleaning, the compressor or thermostat may need professional service.

Locate your coils before you start

Refrigerator coils are in one of two places depending on your model. Rear coils run vertically down the back of the fridge, usually behind a thin metal or plastic panel. Bottom coils sit underneath the fridge in a compartment you access by removing the front grille or kickplate at floor level. Check your refrigerator manual to find out which type yours has—if you don't have the manual, the model number is usually on a sticker inside the fridge, and you can search for it online.

Knowing where your coils are matters because the cleaning method is slightly different. Rear coils are easier to reach but require you to pull the fridge away from the wall. Bottom coils need you to get down on the floor, but the fridge stays in place. Either way, make sure you have enough space to work safely and that you won't trip over the power cord.

Unplug the refrigerator and gather your tools

Always unplug your refrigerator before you clean the coils. This protects you from electrical shock and also stops the compressor from running while you work. The compressor can kick on unexpectedly and startle you, or in rare cases, cause injury. Leave the fridge unplugged for at least five minutes so the compressor has time to stop completely.

You'll need a few simple tools: a vacuum with a brush attachment, a coil brush (a long, thin brush designed specifically for this job), or an old toothbrush, and a damp cloth. A coil brush costs about $10 to $15 at any hardware store and is worth having if you plan to clean the coils regularly. If you don't have one, a soft-bristled toothbrush works fine. Avoid wire brushes or anything abrasive—the coil fins are thin aluminum and bend easily.

Clean rear coils by pulling the fridge away from the wall

If your coils are on the back, pull the refrigerator straight out from the wall slowly. Unplug it first, then grip both sides and slide it out about two feet. Be careful not to kink the water line if your fridge has an ice maker or water dispenser. Once the back is exposed, you'll see the coils running vertically.

Use your vacuum's brush attachment to loosen and remove the top layer of dust. Work from top to bottom so debris falls down and away. Then use your coil brush or toothbrush to gently brush between the fins, moving in the direction the fins run (up and down). Vacuum again to catch what you've loosened. Wipe the coils with a damp cloth to remove any remaining dust, then let them dry completely before pushing the fridge back into place.

Clean bottom coils by removing the front grille

For bottom coils, locate the front grille or kickplate at the base of your refrigerator. This is usually held on by two or three clips or screws. Remove these fasteners and pull the grille straight toward you. You'll see the coils in the compartment underneath, along with a drain pan that collects condensation.

Vacuum the coils thoroughly with the brush attachment, working side to side along the length of the coils. Use your coil brush or toothbrush to brush gently between the fins, then vacuum again. While you're down there, check the drain pan for standing water or debris. If the pan is dirty, remove it (it usually slides out), empty it, and rinse it with warm water before replacing it. Wipe the coils with a damp cloth, let everything dry, and reinstall the grille.

What to do if the coils are very dirty or clogged

If the coils are so packed with dust and hair that you can barely see the fins, you may need to repeat the brushing and vacuuming process two or three times. Be patient and gentle—forcing a brush through clogged fins can bend them permanently. If a fin does bend, you can carefully straighten it with a fin comb (a thin metal tool sold at appliance stores), but prevention is easier than repair.

For stubborn buildup, a soft cloth slightly dampened with water can help loosen dust without damaging the coils. Never use compressed air, which can push debris deeper into the fins instead of removing it. If after cleaning the coils your fridge still runs constantly or doesn't cool properly, the problem may be with the compressor, thermostat, or refrigerant level—these issues require a service technician.

How often to clean and what to watch for

Clean your coils every six to twelve months under normal conditions. If you have pets that shed, live in a dusty area, or run your fridge in a garage or basement, clean them every three to six months. A simple way to remember is to clean them when you change your home's furnace filter, if you have one.

Watch for signs that your coils need cleaning sooner: the fridge running almost constantly, the compressor making more noise than usual, or the back of the fridge feeling unusually hot. These are all signals that the coils are restricting airflow. Keeping up with regular cleaning prevents these problems and keeps your refrigerator running efficiently for many years.

Frequently Asked Questions

Can I clean the coils without unplugging the fridge?

No. Always unplug the refrigerator before cleaning the coils. This protects you from electrical shock and prevents the compressor from running unexpectedly while you're working. Wait at least five minutes after unplugging to let the compressor stop completely.

What's the difference between a coil brush and a regular brush?

A coil brush is long, thin, and flexible, designed to fit between the narrow fins without bending them. A regular toothbrush works in a pinch, but a coil brush is gentler and reaches deeper. They cost $10 to $15 and last for years, making them a worthwhile investment if you clean regularly.

Is it normal for the fridge to feel hot on the back after cleaning?

Yes. The back of the fridge releases heat, so it should feel warm to the touch. However, if it feels extremely hot or the fridge runs constantly even after cleaning, the compressor or thermostat may need service. A properly functioning fridge should cycle on and off throughout the day, not run without stopping.

What if I accidentally bent a coil fin?

A bent fin reduces cooling efficiency slightly but usually doesn't cause immediate problems. You can buy a fin comb at an appliance store and carefully straighten it. If many fins are bent or the fridge isn't cooling well, have a technician check it—the coils may need professional repair or replacement.

Do I need to clean the drain pan at the bottom?

Yes. The drain pan collects condensation and can grow mold or bacteria if left dirty. While you're cleaning the bottom coils, remove the pan, empty it, and rinse it with warm water. A clean pan helps prevent odors and keeps the area under your fridge sanitary.