r/rv_diy

Looking for some information on selecting and replacing a RV rooftop AC unit. I have a 30A travel trailer and the current rooftop unit doesn't perform well. The air blows cool, no cold and it can not keep up with the heat oin our area. I've been researching units and the Furrion Chill Cube keeps popping up. 18k BTU and an AMP draw of 15.5A. Here's my questions:

• Are all AC units generally interchangeable, as in if it's on a 20A circuit, I can replace the current unit with most any unit under 20A draw?
• What electrical considerations should I have when selecting a replacement unit?
• Is the cut out in the roof a standard size or should I expect to have to expand said opening?
• My understanding is the Chill Cube doesn't connect to an existing thermostat. So when I disconnect the current thermostat from the existing AC unit, will the furnace continue to function without issue?
• The current unit is ducted. Do I need to get a distribution box for in addition to ordering the ducted Chill cube?

What other considerations do I need to think about when changing out my existing unit for the Chill Cube?

I have a Norcold N7X 2 way (AC and propane) fridge in my 2019 Jayco. The freezer is very cold (5 degrees), and the fridge is very warm 55 degrees. I don't use AC, this is just on propane. There is a strong blue flame, I changed the thermistor, trailer is level, there is no yellow powder behind the fridge indicating a leak, ventilation behind the fridge is fine, it is not blocked. Every source I have read or watched online says this indicates a clog in the coolant lines, but I have a hunch this is not the problem. A friend has the same problem with his Dometic, he removed his fridge and turned it upside down to "burp" the coolant lines to free up the clog, and it did not work.

One thing that I read, and is interesting, said that the aluminum cooling fins in the top of the fridge have a backing plate that is attached to the coolant lines with a thermo conductive mastic. Sometimes this mastic turns dry and crumbly, and no longer conducts the cold. It said I could unscrew the fin plate, and look behind it, but I don't think I have seen these screws inside the fridge.

Does anyone have an idea?