A:Answer Hello, Hamish625. Thanks for your question. With proper maintenance and installation of our window air conditioners, we wouldn’t expect any mold concerns, as there are no known issues related to it. For further details about care and cleaning, please review page 7 of this model’s Use and Care Guide (https://www.bestbuy.com/site/frigidaire-150-sq-ft-window-mounted-mini-compact-air-conditioner-white/6403903.p?skuId=6403903). -Derrick