If you want fresh, cool air without the stress of a window AC installation , a portable air conditioner can be a great solution. Think of these appliances as AC units on wheels, able to cool a single room without as permanent of an installation in your home and windowsill — a key feature if you live in an apartment or four-season climate. To help find the best portable air conditioners, I spoke with cooling and appliance experts, and got their advice about everything you need to know. Plus, I’