Some highly-rated air conditioner brands include several window models by GE and Friedrich, and central air options by Maytag, Lennox, Carrier, Trane and Amana. None of the portable units received high ratings due to their cost and lack of efficiency, operating at less that 60 percent capacity, according to Consumer Reports.
Reputable online consumer reviews base ratings on cooling efficiency, noise, size, initial investment and long-term utility costs.
The best central air conditioning unit is the Maytag M1200 PSA4BI iQ Drive, according to Consumer Search. The unit features the iQ drive ensuring peak performance and a 12-year warranty.
The best small window air conditioning unit is the GE AEM05LS based on its performance and value.