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I always tell my customers to run the fan on constant, and let the compressor cycle on and off. The air will circulate better, filter the air better, (in your homes the air goes through the filter 7 times in one hr. not sure about the RV's) also constant fan keeps the air from being warm in one part of the space, and cool in another. The air will be as uniformly cool as possible with the fan running. It will also dehumidify a little better.
I think it is less annoying for the constant fan noise, then the compressor kicking in as needed rather than the quiet of no fan, then fan kicking on, then later the compressor after the delay period.
I don't think it is harder for the unit either way. It may be harder on motors starting, than running, but that may be a tiny difference and would depend on the motor.
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