Experts say that a central air conditioner is typically the most efficient way to go to cool down multiple rooms in your home. However, central air is often not a practical or even possible option. Window or through-the-wall air conditioners are the next best choice, and we cover lots of energy-efficient and reliable choices in our report on those. But sometimes, even a window air conditioner won't fly. For example, if you rent an apartment in a building that won't allow them. The last choice is a portable air conditioner. Experts and users say that in terms of performance and energy efficiency, these are the least effective type of air conditioning. Still, portable air conditioners beat sweltering through a nearly unbearable heat wave with nothing more than a fan and a glass of lemonade. The good news is that we've found several portable air conditioners -- in sizes appropriate for small, medium and large rooms -- that do a better job than most in helping you keep your cool. You can get more information on those in our just updated report on portable air conditioners.
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