I need to control the temperature ranges for the freezer and fridge. Ideally, the fridge temperature would range between 2° and 8° C, and the freezer between -25° and -20°. If I set the temp. dial to 8, I get a fridge range of about 1° to 6° C, and a freezer range of about -2° to -21° C. I would like to stabilize the freezer temperature and keep it as low as possible without the fridge going below 2° C. Is that possible?