I've been wondering about interior fans.
In my Norcold the temp sensor is in the fridge bin, attached to the fins. Freezer cools down only during the time when the fridge does, there is one compressor. Under most any weather conditions it's my freezer struggling keeping 0-2F, not the fridge keeping 36-40. If I add the fan, fridge would reach its 36-40 faster and shut down - then freezer would be given less time to cool down, and this might not be enough to cool it to 0-2.
Spending $80 on this fan attachment I could make things worse, please correct me if I'm wrong.