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Inside a ductless head: four layers, and what builds up on each.

Wall-mounted ductless units are quiet and efficient, and they hide their dirt well. In damp, mild bay air the inside can collect dust, slime and mould long before anything looks wrong from the room. Here is what's in there.

A ductless wall unit pulled apart into four layers Four layers stacked on a diagonal from the front of the unit to the back: the front panel with its filters, the finned coil, the round blower wheel, and the drain pan with its drain line leading away. Each layer is numbered one to four. Front panel & filters Coil Blower wheel Drain pan Drain line 1 2 3 4
Layer by layer

What a deep clean reaches.

  1. Front panel & filtersDust and lint. The part you can rinse yourself — and should, regularly.We clean and check the louvres and filters.
  2. CoilA film of dust and grime that chokes airflow and cuts cooling and heating.Cleaned with a coil cleaner and rinsed, electronics covered.
  3. Blower wheelWhere slime and dark mould spots often collect in damp climates — and get blown into the room.Cleaned in place with a protective cover bag underneath.
  4. Drain pan & lineStanding water and slime that can overflow down the wall.Flushed, cleared and tested.

A simplified drawing; heads differ by make and model. A deep clean doesn't replace maintenance of the outdoor unit — we check that on the same visit.

Signs it's time

You'll usually notice one of these first.

A musty smell

Especially in the first minutes after the unit starts.

Dark specks on the louvres

Visible at the outlet where the air comes out.

Weaker airflow or drips

A dirty coil or a blocked drain shows up as either.

A wall-mounted ductless head with its front panel lifted and the filters partly pulled out
Layer 1: the part you can rinse at home.
A technician cleaning a ductless head in place, a fitted plastic cover bag under it draining into a bucket
Layers 2 to 4: cleaned in place, the room kept dry.
Homes

Condos and townhomes

Bedrooms and living rooms where the head runs most of the year.

Businesses

Offices, clinics, studios

Heads and cassettes cleaned before opening or after close.

A close view inside a ductless head showing a clean blower wheel after cleaning
Between visits

Three things you can do.

  • Rinse the filters when they look grey, and let them dry fully
  • Leave the louvres alone — forcing them can damage the motor
  • Call us if it smells, drips or blows weakly
Musty smell?

Book a deep clean.

One head or a whole building.

Book a service call (341) 214-5670
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