Listed below are a few guidelines of temperature ranges based on your type unit: 1  Reach-In Refrigerators 35F to 38F. 2  Walk-In Refrigerators 35F to 38F. 3  Reach-In Freezers +5F to -10F.  Walk-In Freezers 0F to 1  -10F. Ice Cream Freezers -10F to  -20F.