Service area: Chiang Mai province
Unit: Blower wheel of a wall-mounted aircon
Type of work: Aircon cleaning
When: 2026

1 photos from the job

The unit when I arrived, during the work and when I finished.

Before1 photo

What you can check yourself from this case

Arm explains what the photos show, so you can judge the unit at home yourself.

The blower wheel is where dust hides deepest

The blower wheel sits behind the evaporator coil and is barely visible from the front of the unit. Dust that slips past the filters gradually builds up on the blades into a layer, so the airflow gets weaker even when the filters are clean.

Standard and strip-down cleans differ at the blower wheel

A standard clean spray-washes the blower wheel while it is still in the unit, while a strip-down clean takes it out and washes it separately. If the grime on the blades isn't thick yet and there's no odour, a standard clean is enough. I assess this before starting every job.

Why it's better to clean before the smell starts

Once you can smell it, moisture and dust have already built up into grime in the drain tray or the blower, which takes longer to clean than a routine service. Discolouration along the edge of the louvres is a sign you can see before any smell appears.