Some air conditioners, for example Mitsubishi heavy industries SRK20ZJ-S have "self clean" and "allergen clean" functions. First takes 2 hours to complete, latter 1.5 hours.

How often should they be used? I understand this depends, but roughly - once per day/week/month?

  • 1
    Does the manual say anything about how often?
    – Steven
    May 29 '13 at 16:18
  • 1
    @Steven - The manual doesn't say anything about periodic use of the allergen clear and about the self-clean says "CLEAN operation should be run after AUTO, COOL and DRY operation to remove the moisture from inside the indoor unit and control the growth of mold and bacteria".
    – Compro01
    May 29 '13 at 17:21
  • Yes, the manual says nothing. Self clean is rather long operation, so I'm not sure if it should be performed after each COOL, DRY cycle.
    – Roman
    May 30 '13 at 7:10

In lieu of any manufacture recommendations, I would suggest that you use the self-clean method whenever you notice a smell coming from the unit. As a related tip, if you ever notice the A/C in your car smelling bad, run it on max cool and max fan for 20minutes as this kills most of the mold and bacteria that is causing the smell; my guess is that this 2hour cycle does something similar.

I'm really not sure what the allergen clean might do but maybe run if a couple times a year.

It's probably worth noting that most A/C units don't have these functions and work fine for many years; it might be more of a marketing gimmick than anything else.

  • Hi Steven. Here I was talking about home A/C but not car A/C. Manual says that "allergen clean" is special set of cool/heat/dry operations, 1.5 hours long. But it says nothing when it should be run.
    – Roman
    May 30 '13 at 7:14
  • It sounds like "allergen clean" means "try to discourage growth of mold in the A/C."
    – keshlam
    Jun 8 '14 at 16:22

Samsung recommends to perform self-clean operation every 15 days.


Every few weeks according the MHI Australian website: https://mhiaa.com.au/how-air-conditioners-can-help-improve-indoor-air-quality/

  • While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. - From Review
    – FreeMan
    Nov 6 '21 at 12:07

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