I have 4 computer fans across the opening below the screen. Wires together and controlled by a button thermostat and 2 more in the side opening blowing up from the bottom also on the thermostat. I found button thermostats on E-Bay that activated at 10 degrees lower than the stock one and used one to replace the stock one and the second one for my added fans
We have one of the infamous Norcold 1200 LRIMSS 4 door refer/freezers that had the cooling unit fail. We had a Amish cooling unit installed and the fans are to help it as much as possible. It seems to work well.
Jim