9000 BTU 4-in-1 Portable Air Conditioner with Sleep Mode

The Costway 9000 BTU 4-in-1 portable air conditioner stands out for quiet, considered cooling, running at just ≤54 dB, which is low enough to leave on through the night without disturbing light sleepers. Four modes (cool, dry, fan and sleep) cover the year, with 9000 BTU bringing bedrooms and living rooms back to comfort quickly and evenly and a 20 L/day dehumidifier mode handling damp. The sleep mode raises the set temperature gradually over time, and a 1-12 hour timer lets you drift off without it running all night. A genuinely useful feature is dual drainage: both manual and continuous options are supported, with a 3m drain hose included, so for long humid spells you can set it to drain continuously and skip emptying. Rated at 960W in cooling, it costs roughly 25p an hour at 26p/kWh. As a single-hose monobloc it must be vented through a window using the supplied 150cm exhaust hose and window kit, so it isn't a hoseless unit; the window kit fits most windows for easy setup. Control is via the LED panel or remote. At 23kg it's movable between rooms. The box includes the AC, remote, exhaust hose, hose connector, adapter, drain hose and manual.