I have the MH in my sig and the a/c compressor went out in 2009.....Very low miles/use on the MH at that time......
Took it to Ford and got a new compressor, etc....Interesting comment by the service advisor---he told me they work on many Ford MH's and they replace many, many a/c compressors in low mileage MH's.........Much more than in autos......
In explaining, he said that the seals are many times the problem...He advised to use the a/c often, even if not needed, just to exercise the compressor, etc......Says it is good for the seals, etc.....Made sense to me....