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In a standard room with 8-foot ceilings, use these estimations: 8,000 BTUs will cover 200 sq. ft. (1,600 cubic feet) 10,000 BTUs will cover 300 sq. ft. (2,400 cubic feet) 12,000 BTUs will cover 400 sq. ft. (3,200 cubic feet) 1 May 2014 Using a portable air conditioner with a BTU level higher than using our BTU cooling calculator to determine the specific amount of BTUs you Up to 200 sq ft: look for an 8,000-BTU unit. Up to 300 sq ft: look for a 10,000-BTU unit. Up to 400 sq ft: look for a 12,000-BTU unit. Up to 450 sq ft: look for a 13,000-BTU unit. A portable unit producing 5,000 BTUs can ably cool a room from 150 to 250 square feet in size, while the more powerful 14,000 BTU model can handle rooms as large as 500 square feet. The standard rule is that a portable air conditioner unit needs BTU estimates for three common room sizes:. 7 Jul 2016 Before you buy a portable AC unit, check out our guide on what you one 18,000 BTU portable air conditioner will cool the whole space, 9 May 2018 When it comes to air conditioners, the BTU rating tells you how many BTUs per hour Do I Need to Do Anything Differently for a Portable A/C?Our handy BTU calculator and chart make it easy to find the correct air conditioner size for your needs. No calculations or formulas necessary. Before you buy a portable air conditioner, make sure you know what size to buy. Our easy guide will show you how to calculate square footage and BTUs. What size portable AC unit do you need? Learn how they work and check out our portable air conditioner sizing chart for ideas at Air & Water.