Technician working on the back and mechanical components of a refrigeration unit, illustrating coil-cleaning maintenance.
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A refrigerator works by moving heat out through its condenser coils, and dust is an insulator — pack enough of it onto the coils and the compressor has to run longer and hotter to do the same job. Clean refrigerator coils regularly and you get a fridge that runs quieter, uses less energy, and lasts longer before the compressor gives out.

How often to clean them

Twice a year is the general recommendation for most households — a light sweep or vacuum at the coils is enough to keep dust from building into a thick, insulating mat. Move that up if any of these apply to you:

  • You have pets, especially shedding pets, since pet hair clumps with dust far faster than dust alone
  • Your kitchen floor is carpeted or high-traffic, both of which push more dust and debris toward the fridge's base
  • The fridge sits in a dusty environment, like near a laundry room or a frequently used entryway

How to find and clean them

Refrigerator coils are located in one of two places depending on the model:

  • Behind the fridge, as a black grid mounted on the rear panel — common on older models
  • Underneath the fridge, behind a removable grille or kick plate at the bottom front — common on most modern models

To clean them:

  1. Unplug the refrigerator before doing anything else.
  2. Locate the coils. If they're on the back, pull the fridge away from the wall carefully (get help if it's heavy, and watch the water line if you have an ice maker). If they're underneath, remove the bottom front grille — it usually unclips or unscrews.
  3. Vacuum the coils with a brush attachment, working in the direction of the coil fins rather than against them to avoid bending them.
  4. Use a coil-cleaning brush (a long, narrow, flexible-bristled brush made for this) to get between and behind the coils where a vacuum nozzle can't reach — this is where the thickest buildup usually hides.
  5. Vacuum the floor and surrounding area afterward, since a fair amount of dust gets knocked loose during the process.
  6. Replace the grille or push the fridge back into place, then plug it back in.

Signs your coils are overdue for cleaning

  • The fridge feels warm to the touch on the back or sides
  • The motor runs more frequently or for longer stretches than it used to
  • Food isn't staying as cold as it should, even with the temperature dial unchanged
  • You can visibly see a gray, felt-like layer of dust on the coils when you check them

The takeaway

Coil cleaning is one of the lowest-effort, highest-payoff maintenance tasks in the kitchen — a vacuum and a coil brush, twice a year, is the whole job. Skip it for long enough and the fridge doesn't fail outright; it just runs hotter and less efficiently until the compressor wears out well before its time. Put it on the same twice-yearly calendar as your HVAC filter change, and you won't forget it.

Derek Callahan
Editor

38-year-old licensed general contractor with 18 years in residential construction and repair. Derek spent over a decade as a union carpenter before going full-time into writing, and now tests every guide in his own century-old fixer-upper. Holds active residential contractor licensing in three states.