I'm wondering if the thermostat on these outdoor units is measuring the air temp at the point it enters the unit ... or does it measure the ambient air around the unit? this would certainly effect the comfort level inside the trailer.
The GE unit that I converted to sit outside with hoses ducting the air in and out of the Scamp
measures the temperature at the point of return into the air conditioner. Mine uses a temperature probe that I believe mechanically actuates the compressor switch. I've thought about running an actual electrical
thermostat line to the trailer for a conventional setup to do the same thing, but elected to install a simple on/off switch inside the trailer that controls the AC unit outside.