Case study · Preventive maintenance
Ductless Deep Cleaning – Lower East Side, Manhattan
A wall-mounted ductless unit serving a residential building's 6th-floor hallway had gone without proper service for an extended period. We took it apart, cleaned every component, and documented the whole job with photos.
What we found
- Mold growth, slime and sludge along the full length of the condensate drain pan.
- Mold spotting on the discharge louvers, vanes and linkage, the last surfaces the air touches before it enters the hallway.
- Air filters packed with dust and lint, restricting airflow.
- Heavy dark buildup on the blower housing and insulation.
- Water staining on the wall below the unit, consistent with past condensate overflow.
What we did
- Protected the hallway and set up a coil cleaning bag to capture all runoff.
- Disassembled the unit: front panel, grille and drain pan assembly, louvers, filters and blower wheel.
- Cleaned the evaporator coil and blower housing in place and rinsed thoroughly.
- Cleaned the removed components on the roof with cleaner and a pressure washer.
- Reassembled the unit and checked operation.
Our recommendation: keep every unit on a schedule
The building's other common-area units run under the same conditions and are likely in similar shape. Dirty drain pans, filters and coils hurt indoor air quality, cause water damage, raise electricity use and shorten equipment life.
We recommended an initial deep cleaning of every common-area unit, then semiannual preventive maintenance in spring and fall: filters, coil and blower wheel cleaned, drain pan treated and drain line flushed, refrigerant pressures, electrical connections and controls checked. A written photo report follows every visit, so the board has a record.
Request a maintenance assessmentRelated: Ductless mini-split cleaning · HVAC and refrigeration in Manhattan · All projects