Use this Keystone 12,000 BTU Portable AC with Inverter to efficiently cool medium-sized spaces up to 450 square feet. This air conditioner features a variable-speed inverter that eliminates wasted operation, a dehumidification mode that removes excess indoor humidity, and flexible installation options. Cooling Power: This air conditioner has 10,000 to 12,000 BTUs of cooling power, and its multiple advanced features make it perfect for climate control in medium-sized rooms up to 450 square feet. Dehumidification: This model can remove up to 4.12 pints per hour from humid rooms while prioritizing dehumidification in Dry Mode. Portability: This 75-pound unit's rolling casters make it easy to move and maneuver in your chosen space. The 5.5-foot power cord also gives owners flexibility over the unit's position. Quiet Operation: This unit's indoor noise levels range from 42.5 to 53.5 dB, which is similar to the average room noise level. Inverter Efficiency Unlike most portable air conditioners today, this Keystone 12,000 BTU air conditioner has highly efficient inverter technology that regulates the motor speed and provides the right amount of cooling power to keep a space comfortable. This unit operates efficiently with a 14.7 CEER (Combined Energy Efficiency Rating) and has an estimated annual energy cost of about $60 for most homes. Advanced Operation This air conditioner's onboard display and push buttons might seem simple at first glance, but users might be surprised at its advanced functions once you move past the simple temperature setting and three basic fan speeds. Auto Mode: This mode eliminates fiddling with settings and speeds by automatically adjusting cooling power and fan speeds based on a user's set temperature. Sleep Mode: This optional mode gradually increases the temperature by 2 degrees F every 30 minutes for an hour and maintains the higher temperature for 7 hours before returning to the user's preferred daytime temperature. Programmable Timer: This 24-hour programmable timer mode allows users to set a startup countdown in half-hour or hour increments, delaying the air conditioner's startup. Auto-Swing Louver: Improve air circulation with this automatic air louver swing function that spreads cool air in a high wide arc. Installation and Maintenance Although it is a portable air conditioner, Keystone designed this model to be used or installed in multiple settings and situations, giving users more control over their space and comfort. One day, you can use it as a standalone portable air conditioner; the next, you can install it through a window for effective exhaust venting. The unit also includes multiple easy maintenance features that take the hassle out of using it. Installation Kit: This portable air conditioner includes all hardware, frames, adapters, braces, seals, and foam needed for exhaust venting through a window. It also includes a condensate Drain hose, a power cord storage buckle, and a washable filter. Window Requirements: This model can be installed on hanging windows 19.1 to 63.8 inches wide or sliding windows 26.8 to 49.0 inches tall. Washable Filter: Remove and clean the washable air filter every two weeks or as needed for optimal unit performance. Continuous Drain: The included drain hose will help you easily remove condensate collected by the unit as it prioritizes dehumidification when selecting the Dry Mode. Summary Customers will be pleased with the power and efficiency offered by this 12,000 BTU air conditioner. Deceptively simple on the outside, this portable air conditioner from Keystone has an advanced inverter that boosts efficiency compared to similar comparable models.