as they are a "split system" type of aircon, (I think?) a good idea maybe to get your local Fridgy to check it out.
they usually only good for about 10* below ambient are they not??? (showing complete ignorance of the running of an aircon)
I have the Thruma roof one (what ever its called) - so I'm as helpful as a left sock on its own.
but if in doubt, check it out