The short term [partial] solution is to quit using the opening door, if possible
, and use only the top opening. In addition, plan the openings, limit them as much as possible. Probably the only leaks
you are dealing with are human induced.
At some point, you will want to improve the insulation. This will often mean making the fridge somewhat smaller, but you buy the best insulation product you can find, and line the fridge with it. The insulating properties of the material you use will be listed so you can work out how much you will need. Your current
fridge probably has some low-to-medium grade insulation in it, maybe 2" thick, which you will find inadequate for warmer climes in summer, also for somewhere equatorial, which is never cool.
Another possible solution is to upgrade the fridge itself: what I would look for are refrigerators for use in outback areas where it is both hot and power is limited for storing medicines that require cooling
, like the Australian "Trailblaza". This would mean removing the current
fridge and finding a new one that will fit, maybe not easy. Sometimes you can insulate around the outside of your present box, an approach that has some appeal if you can create the access. Jim did this on our first Insatiable, using spray in closed cell foam. [And, as far as I know, it never absorbed moisture from the air.]
If you're on shore power
now, I suggest you switch to your batteries, which you will rely on on the ARC*, and see what the load for your fridge in your current situation is. If your batteries can't keep up, you'll want to decide how you want to address the problem...larger battery
bank, more engine
running, or go with less refrigeration
(set the thermostat somewhat warmer and see how you live with that--things will spoil faster, though), or no refrigeration
. It is common for new cruisers to have problems with refrigeration, you are right to be concerned.
Decommissioning the front opener, or at least installing PVC strips between the goods and the opening (as is done in some supermarkets, to help keep the cold in) until such time as you can reconfigure it to a top loading box exclusively will serve you best.
Good luck with it,
*you will find it somewhat cooler on the water
away from land than in a marina