Seb,
Is it running all the time when you are set to 18 C? If so, that is
the limit of the unit, you would need a bigger one. 8000 BTU's should
get that room pretty cold.

You can buy lower temperature thermostats if it's not always on, or
maybe you can play with the calibration of the thermostat. That voids
the warranty, so I'm not suggesting you do that on a brand new unit.
If you were to try that, you would pull the knob off of the one you
have and see if the shaft is hollow. If so, it may have a calibration
screw inside you can adjust. Often times there is a set screw on top
of the adjusting screw to lock it down that has to be removed; I would
think GE would do that, it's a good unit. Some of them have an
adjustable stop that sits on the outer ring of the mounting stub
instead.

All it really is is a switch, if you bought a lower temp thermostat
you would just replace it. If you do decide to play with that
remember to mark your starting point so you can undo the adjustment...

The cheapest line voltage thermostat I see in Johnstone supply that
works for cooling is a ETD5SS for around $14 (US). (You want the SPDT
action, you want it to go off on temperature 'fall'.) It does not say
who makes it, sorry. It says it goes from 50 F to 90F. The Johnstone
PN is L37-725. Grainer is in Canada, they would sell these too. Or,
just look up appliance repair in your phone book for suppliers.

If your relative humidity is still at 80% with it running you may have
a water problem in the walls or floor. The cooling coils in the AC
will still be well below 18 C and moisture should be condensing on
them and draining out. If that drips into a bucket and is a few
gallons per day it's coming in the basement somewhere. It could take
several days to dehumidify, give it at least a week before doing
anything.

Hope that helps,
Joe

(seb) wrote in message om>...
> I do my winemaking in a 16 X 16 room in the basement of my new house.
> The humidity are too high in the summer, around 80% and sometimes even
> more. The temp is constant at around 18 C. I recently buy a
> deshumidifier unit but the temp rise to as much as 23-24 C so i got
> other problems. I decided to exchange the unit against an AC unit.
> Guess what ? It only work between 18 and 30 Celcius ! Is there
> something i can do to be able to drop the temp around 16 C ? I am
> thinking of some mod to the temperature prob of the unit. The AC unit
> is a window mount 8000 BTU unit made by GE.
>
> Any help is appreciated,
> Séb