10 Best Energy Efficient Air Conditioners to Keep You Cool Without Raising Your Bill

9. Frigidaire FFRE0533S1 -- Small but Smart

Frigidaire makes a lot of appearances on this list for good reason. The FFRE0533S1 stands out thanks to its programmable timer, energy saver mode, and clean filter alert. It's just 5,000 BTUs, but it's perfect for bedrooms or tight studio apartments. You get advanced features without sacrificing simplicity.