19C outside, and it's 32C inside! how much would a 15k BTU aircon cost to run?

I've of the opinion that device is not what we in the states call an air conditioner. An air conditioner absorbs heat and then discharges it outside. This device doesn't discharge anything outside and if you look at the warranty, it uses the language " Year Breakdown Cover - Dehumidifier". I believe it is just a dehumidifier and it will do nothing to cool your room, though it will lower the humidity which will make it more comfortable.