This is a rough draft and incomplete. Please forgive any incoherent thoughts, wrong information, disorganization, or rambling. I'll update this soon.

The refrigerator used in the 17' Casita for decades no longer has a direct replacement. The Dometic RM2454, it's variants, and any applicable Norcold has stopped being produced. There is no refrigerator that I'm aware that fits this space properly. Enter the Casita Works Solution!

Having replaced many refrigerators, I know the space and process well. Based on this experience, my solution will use a marine, compressor style refrigerator for two main reasons. I believe this is the future of RV refrigerators and we'll see less and less ammonia absorption as the years go on. Battery and solar technology are making boondocking extremely doable.

The second major reason for switching to a compressor based refrigerator is the nature of how ammonia absorption cycle works. Cliff notes if you want to skip this section: the space needs correct convection for ammonia absorption to work safely and efficiently. Retrofitting a different size ammonia absorption fridge into the original space changes too much.

In general, all refrigeration works by moving heat from one place to another using phase changes of a refrigerant.