Portable AC vs Window Kit: Compact Cool 450 sq ft... Compelling, Tested Design Insights We’ve tested the 10000 BTU Portable Air Conditioner and found it to be a compelling choice for cooling up to 450 sq. ft. Unlike window units, this 3-in-1 unit offers remote control, 24H timer, and sleep mode, making it incredibly convenient. While window kits are cheaper, the versatility of our portable model shines when renters or those with sliding doors need flexibility. The digital display and window installation kit further enhance its usability. Yet, its 21.5-inch wide design requires careful placement—no sneaking it under a door like some smaller units. Still, for its space-saving efficiency, it balances performance and portability admirably. We appreciate the duffel bag storage and remote start, ensuring the room cools before we step in. Whether tied to an indoor vent or running standalone, this unit proves its worth in our test scenarios.