Hi Mike. Just looked thru paperwork that came with my WH
Manufacturer is Airxcel, and at the bottom of the front page it says
"Designed and Manufactured by the makers of Coleman MACH air conditioners"
Model #8330 633 This is the ceiling assembly
It is designed for 47200, 48200 or 49200 air conditioners.
Probably should check your ceiling assembly model before getting a new a/c to make sure of proper match.
My 15k unit has worked just fine in 95 degree heat. However, when it is that hot the voltage in our favorite camp ground, Dreher Island St Park in SC tends to drop down to less than 110 volts at times.
Also a great addition would be a digital thermostat which will keep your heating and a/c within a one degree range. Coleman digital thermostats are available from Amazon for about $70. It is a direct replacement to your analogue thermostat and will take you less than 10 minutes to swap out.