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The 6 best portable air conditioners of 2025, including options to help with wildfire smokeWhat to look for in a portable air conditioner Btu and room size: One British thermal unit (Btu) equals the heat needed to raise one pound of water by one degree Fahrenheit. In cooling ...
It really depends on the size of the air conditioner and the size of the room you’re trying to keep cool. The Energy Star Most Efficient units at 8,000 BTU -- about enough to cool a 300- to 350 ...
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