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Portable unit with no outdoor unit — does it deserve professional sanitising or is it a different story?

Editorial guide · Updated 18 September 2026

In short Short answer: yes, it needs sanitising just as much — the evaporator in a portable unit gets wet the same way as a wall split and grows biofilm the same way — but access differs: the side/front housing opens up, not a wall grille, and the internal condensate tank (if it has one) is emptied and cleaned separately. See current rates on the Prices page.

This page explains a situation in an editorial format. It is not an open discussion board or a verified customer review. Contact us on WhatsApp about your own appliance.

Situation discussed

I have a portable air conditioner (De'Longhi, window hose type) in a rented studio in Berceni, because I'm not allowed to mount an outdoor unit on the façade. I use it 3-4 months a summer. Can it get the same cover-and-pressure-wash sanitising as a wall split, or is a portable different because of the water tank and wheels?

Editorial explanation · Revizie AC

What is really happening

A contaminated air conditioner, regardless of type, can raise room fungal air concentration from a few hundred to tens of thousands of units per cubic metre at start-up — the mechanism is identical in a portable, because the cold, wet indoor evaporator is the source, not an outdoor unit (which a portable doesn't have as a separate piece anyway, just the heat-exhaust hose). Only the housing and mechanical access differ, not the physics of fouling.

Explanatory diagramPortable unit: three distinct areas
Portable unit: three distinct areas
  1. The filter and air intake.
  2. The exhaust hose fitted according to the manual.
  3. Condensate handling depends on the model and operating mode.
What the studies say
  • When a contaminated air conditioner starts, airborne fungal concentration in the room can jump from 40–920 to 5,500–100,000 CFU/m³. [Indoor Air, 2023]
  • Mould does not grow below roughly 80% surface relative humidity, but the cold surfaces inside an air conditioner constantly exceed this threshold. [WHO / NCBI Bookshelf, 2009]
  • Manufacturers prohibit benzine, thinner, scouring powder or insecticide on the indoor unit; only water and neutral detergent are allowed. [Mitsubishi Electric, 2020]

What we do on site

  1. We open the side/front housing per the model, protect the surrounding area with foil (not worked through a wall grille like a split).
  2. We empty and clean the internal condensate tank if present, alkaline detergent, adjustable pressure wash adapted to the small internal space.
  3. Fragrance-free sanitising, drying, filters (usually side sponges), housing reassembly and functional test.
  4. See current rates on the Prices page.

What you can do yourself

  • Empty the condensate tank after each use if the model has no continuous drain.
  • Side sponge filters every two weeks, easy to wash with water.
  • Run it on 'Fan' for 20-30 minutes before storing it at season's end.

What NOT to do

  • Do not use petrol, solvents or scouring powder on the internal housing — just as forbidden as on any other unit type.
  • Do not store the portable unit wet at the end of summer — mould keeps growing shut in a garage/storage room.

Prevention

See current rates on the Prices page.

When to call us

0764 012 943, WhatsApp, Monday–Saturday 08:00–20:00; send us the unit's model for an exact price.

Sanitising a ceiling cassette in a dental clinic with a special cover
Sanitising a ceiling cassette in a dental clinic with a special cover
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← Multi-split with one outdoor unit and 4 indoor units — do we sanitise them all at once or one by one?→ See current rates on the Prices page.

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Sources (5)

The information on this page is educational and based on cited sources; it does not replace medical advice. We do not do repairs, installation or refrigerant circuit work.