Question: how many btus do i need?
Answer: Consumer Reports recommends 20 BTUs per square foot of the living space (or spaces) you want to cool down. But no worries about having to do any confusing equations—luckily there's a convenient list for figuring how much A/C power you need for a room, based on the room's square footage: 150 – 250 sq. feet: 6,000 BTUs.