All answers are good and employing a combo of them works even better. Here's some info regarding personal experience. We are on are second fridge In 4 years. The first worked well but had an exterior coil fan failure and when the fan was replaced it was the wrong type and/or failed to operate properly. New fan plus two more installed. They didn't work properly. New fridge installed with 2 new and better exterior fans. Added 2 free-standing, battery operated interior fans. Works fine now. Problems were compounded by a number of factors. 1 dark exterior sides, fridge in slide out that vertical wall at top of slide not out roof. There was also a dead space at the top of the venting chase that trapped the hot air. When three fans were installed two thermostat switches were use. One was defective so only one fan worked.
Don't pack the fridge where no interior air flow can occur. Minimize time door is open. Depending on the conditions It could take up to one hour to reduce temp one degree. Keep a reusable freezer block in the freezer to use in fridge when temps climb. We also purchased a 12/110 volt fridge for basement to keep extra drinks and items not used regularly cool. Good units will maintain temps for a couple of hours even when not plugged in.
With our previous A and C units we never had a propane fridge problem but the exteriors were always white and/or light color and they vented up through roof. Operation was noticably better as evidenced by the minimum amount of time the exterior coil fans operated.
Hope this helps. Good luck
