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

5. Frigidaire FFRA051ZA1 -- Reliable Cooling with a Small Footprint

This model is like the cousin of the FFRA0511R1E, but with a little extra polish. You get similar energy efficiency, solid construction, and a compact design. Ideal for small rooms or dorms where space is tight but the summer heat is not. It's not a smart AC, but it is smart with power usage.