I've tested dozens of air conditioners for my job, and this LG portable AC is the one I trust to cool my bedroom

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The LG portable air conditioner connects to the outside with a sliding plastic insert that enables it to fit windows of various shapes and sizes.

LG; James Brains/Business Insider

For way too long, I suffered through hot summer nights without an air conditioner. My bedroom just wouldn't accommodate a window unit. Then, I learned about the best portable air conditioners, which work with just about any opening to the outside world...