We spent some time in Yuma during the hot October weather and the fridge just had a hard time keeping up and the noisy fan ran non stop. With the advice of a neighbour I ordered some performance upgrade parts from The Cooling Unit Warehouse, I replaced the noisy evaporator fan with 2 Quiet Fans, I installed a fan at the top rear vent to pull the hot air out and installed an interior circulation fan on the interior condenser fins which runs constantly. I have to say that we are delighted with the results no annoying fan noise, no frost build up and the fridge works better than ever at the lowest setting. For info on the fans etc. check online
https://rvcoolingunit.com there are many options and all the info as to fan sizes, power draw, pricing and CFM
If you need to call them I found them very helpful