Guess work turned bad

Dont ever try to guess a gadget if you don’t speak the language ha ha ha
I thought I turned on the A/C before leaving the room for dinner.
When I got back three hours later, it was obvious that had guessed wrongly!
The room had turned in to a sauna!!
I had turned on the  heater which was blasting out hot air!!
I had even made sure doors and windows were shut tight to try to be as energy efficient as possible. Well I now took a really close look at the characters and I have the Cooler on, Hopefully it won’t be too bad tonight.
Catching a train at 7 am so I’m getting up at 6 am!