What size is the window kit? Jessica 19 October 2021 12:03 Updated All the air conditioners we sell have the same size window kit which is 400 cm x 39 cm. Related articles Why is the window kit heat exhaust hose so short? Can I buy a longer heat exhaust hose? How often do I need to drain the water tank? Can I use a portable air conditioner in a room without a window? Does my air conditioner unit double up as a heater in the winter?