I think Petmoose is talking about this:
http://smartrvproducts.com/works/
The ARP is a safety devices that monitors the boiler temperature of an RV refrigerator and shuts it down before it overheats. Once the boiler has cooled to a safe temp, the ARP restarts the boiler. Overheating can cause the boiler/cooling unit to fail and possibly also result in a fire. Most often the boiler overheats because the frig is operated out of level.
There is a version of the ARP the will also control additional fans on the outside of the frig in the back of it. These additional fans do help the performance the frig somewhat, but the main value provided by the ARP is safety and longevity of the cooling unit by preventing overheating.
Putting a fan inside the cooling cavity (where the food goes) makes a significant improvement in the cool down time and also provides a more even temperature throughout the frig.
There are several options for frig fans from the ones by Camco that run on batteries to ones that are wired in. Search for "refrigerator fan" on eBay to see all the options. If you want the top of the line option, the "SmartRVProducts Fridge-Fix" is it at ONLY $100! The ones on eBay for about $20 do almost the same thing but without a light or shroud.
We've used the wired in version in three different rigs we have had, a great improvement in frig performance.
Dave
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Dave, Barb, and Paisley the Wonder Wiemeraner
Was - 2015 3160RL Legacy Edition & 2014 F350 6.7l PSD SRW Platinum
Now - SOB