My fist thought is that you may have a bad seal between the cooling unit and the box allowing some amount of air flow. You should not need to set the temp to 9 with the Amish unit. Mine is set on 4 or 5 max in temps up to low 90s outside. Maybe if you are in PHX or Vegas that is different. Did you do the install?
I did the original install on mine and over a short period of time I had to keep raising the number higher to get it to cool lower. When I was in the area, I had JR at JC Refrigeration pull it as I thought it was the unit. Turns out I did not make the seal good enough and just the slightest bit of air getting past the foam was the main issue. The unit itself was just a bit shy of 100% performance so he replaced the cooling unit also.
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