I have not. I have a weird setup where the windows in my bedroom do not allow for an air conditioner and I have to use the one in the living room to cool the apartment. I think I will turn it on soon as I was very warm this morning when I woke up. My apartment is on the first floor and it is basement level so it keeps a milder temperature. And obviously people in the south (US) and warn climates use it most of the year, so this question is not for them. I also understand that it parts of Europe AC is not as popular as in the US.