I'm using a remote digital thermometer unit. There's a sender in the freezer, refrigerator and outside at the front of the MH. It also provides the MH inside temps.
It's very similar to
this unit. It also records the min and max temps for each sensor.
We don't use the ice maker so that I don't have to winterize it. We do use and keep bagged ice in the freeze. Ice cream is very soft in it.
In the refer we have a three fan unit that attaches to the ceiling of the refer in front of the fins blowing air through them circulating it around the refer.
Bill