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Hi Andrew! Thanks for inquiring about our Insignia™ - 350 Sq. Ft. Portable Air Conditioner. Generally, humming sounds are normal because of the refrigerant flowing inside the Portable AC. Other factors could affect, like when the unit is not levelled or when the filter is blocked with dust or animal hair. - James | Insignia Support | https://www.bestbuy.com/site/brands/best-buy-brands/pcmcat1596746025285.c?id=pcmcat1596746025285
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