This gives you the square footage of the room. Check the chart below to find out the best size air conditioner for you. For example, a room that’s 20 feet long by 10 feet wide is 200 square feet.

An air conditioner that is too powerful for the room will not remove enough humidity, because it cools too quickly. And of course, a model that is too weak will fail to make a room comfortable.

Debbie Wolfe is an author and content creator. In addition to being a contributing writer at Forbes, she writes for other leading online home improvement, DIY, and garden media outlets and online ...

Size matters when you’re buying a window air conditioner. An air conditioner that’s too small will struggle to keep a room at a comfortable temperature. A model that’s too big will cool a ...

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We'll walk you through everything you need to know. You may assume that the size of your room dictates the capacity of air conditioner you should buy. But although room size is an important ...