The Honeywell MM Series portable air conditioner with heat pump is a 4-in-1 unit combining an air conditioner, dehumidifier, fan and heater all into one portable unit. Plus the full-function remote control allows you to operate it from across the room. Unlike a fixed AC with heat pump, this unit requires no permanent installation and four caster wheels provide easy mobility between areas. The auto-evaporation system allows for hours of continuous operation with no water to drain or no bucket to empty. This model comes with everything needed including a flexible exhaust hose and an easy-to-install window venting kit. The window vent can be removed when the unit is not in use. *In October 2017, the Department of Energy implemented a new test procedure which take various factors into account and generate a lower BTU rating of portable air conditioners to indicate capacity. However, the actual capacity has not changed - the difference is simply due to the different test procedure. 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. Please also refer to Aham website.