^^^ Maybe by Years Three Four and Five Dometic will have corrected whatever's letting the refrigerant out. Maybe by going back to whatever kept the refrigerant in before somebody said they could save $1.11 a unit by....
Discussions on RV.net have seemed to trend in the direction of Coleman and Dometic having about equal reliability. We've had only two RV's and both had plain vanilla Coleman A/C. Not ducted, no wall thermostat, no heat pump, no heat strip. Just old "window shakers" adapted to rooftop configuration with a $150 plastic shroud.
First Coleman (13500) ran to Age 25 with a cleaning, a shroud, and oiling the blower.
Second Coleman (15000) has run since 2002 with a cleaning and a blower motor. That includes over three years fulltiming.
What's changing? I've thought that if I had to replace our current Coleman I'd look for features and price between Coleman and Dometic. Now I'm thinking I'd look for the best deal I can get on Coleman.