Keystone's portable air conditioner with "Follow Me" remote control features 3 modes to keep you comfortable - cool, fan and dry. Designed for a room up to 50 square feet, features include electronic controls with LED display, a temperature sensing remote control, and auto restart after a power outage. Omni-directional casters roll the unit easily from room to room wherever you need relief. Plus, this self-evaporative unit includes a flexible exhaust hose and window venting kit for quick and easy setup. In October 2017, the Department of Energy implemented a new test procedure to determine the BTU rating of portable air conditioners. The procedural change has adjusted the amount of BTUs allowed to be claimed downward by as much as 50%. There have been no internal changes to these units, and the functionality remains the same. Please refer to room size guidelines to find the portable air conditioner that best meets your needs.