Energy EfficiencyEnhanced Energy Efficiency With An Eer Of 11.0 Cooling Capacity18,600/18,000 Btu Vertical Space-Saving DesignOptimizes Usable Floor Space With Hidden Closet Design Reliable & QuietEvery Component Is Engineered To Provide Exceptional Performance Robust Plenum Gasket Seals Keep Dirt Outside And Reduces Chassis Vibration Corrosion Treatment On Outside Coils Standard Filter Size Internal Diagnostic Program Auxiliary Fan Ready Room Air Sampling Feature Maintains A Balanced Temperature Throughout The Room Remote Wall Thermostat Capable