If you put a 10K resistor in series and a switch across the temp probe it will force the fan to high and the display to 20C this will keep the alarm from going off and will give you about 5 to 6 degrees colder under load. And I wouldn't add any cap tube to it, you can get it colder but you will lose capacity. As I mod them the system is loaded up as much as it can handle an dgranted a longer capillary will unload uit and lower the current draw the current mods I do will keep the compressor cool while those with the captube also modded have a tendancy to cause excessive heating of the compressor.