目前可以买到的最安静的便携式空调是什么？

The Black+Decker BPACT08WT is an 8,000 BTU portable 3-in-1 air conditioner (cool, fan, dehumidify) designed to cool smaller rooms. It uses auto water evaporation and includes a window kit for venting while staying portable. It runs about 58.6 dBA on high fan based on testing.

The Whynter ARC-14S is a dual-hose portable AC that cools up to 500 sq. ft. It also dehumidifies up to 71 pints/day and uses an auto-drain/self-evaporating approach to handle condensate in most environments. It's designed for spaces without permanent installation using the included window kit.

This portable LG air conditioner provides 8,000 BTU SACC cooling for rooms up to 350 sq ft. It includes Wi-Fi control, cool, dehumidify and fan modes, two cooling speeds, an auto-swing vent and an auto-evaporation system.

The Whynter ARC-14S is a dual-hose portable air conditioner with 9,500 BTU SACC cooling capacity for spaces up to 500 sq ft. It includes air conditioning, fan, and dehumidifier modes, plus auto-drain technology, carbon filtration, and a window kit, making it suitable for larger rooms, home offices, and bedrooms.

This portable 3-in-1 air conditioner provides cooling, fan circulation, and dehumidification for rooms up to 250 sq ft. It includes Hubspace smart control, a remote, washable filter, two fan speeds, and a window venting kit, making it suitable for bedrooms, home offices, and other small rooms.