YOU SAID:

It's really hot it would be great if we could turn the aircon on

INTO JAPANESE

airconをonにすることができれば本当に暑いです

BACK INTO ENGLISH

It would be really hot if I could turn on aircon

INTO JAPANESE

もし私がairconをオンにできるのなら、本当に暑いでしょう

BACK INTO ENGLISH

It would be really hot if I could turn on aircon