i am not sure the brand makes much difference. others might disagree, but i think the new ones are all quite good and reliable.
i put a new coleman mach on mine last summer. i would just make sure you get the 15,000 btu ones.
you can also get ones that are a heat pump so they heat as well. i replaced one that had the heat pump with just a plain air conditioner. i have enough heaters in my coach.
i would just get the one you like the look and feel of.
sorry i am not more help.
regards,
tom
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