Product review (2 stars): More Problems with Temperature
I also have had problems with the temperature on my dispenser.  At first, the coldest my unit would get was 40-42 degrees. Haier instructed me to disassemble the thermostat housing and turn the adjustment screw, which I did.

Now the refrigeration kicks in at 40 degrees and cools down to 28 degrees before it stops!!  That is a big variation in temperature!  I e-mailed Haier and have not heard anything yet.