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Most machinery lasts longer when you run it every month or so at least. For an AC unit there is lubricant in the refrigerant, so circulating the refrigerant once in a while keeps the seals in good condition. It would also keep the moving parts of things like fans from corroding and seizing up.
For vehicles, running the them occasionally circulates the fluids like oil and antifreeze. The oil keeps the moving parts of the engine coated and doesn't allow things like condensation to rust the internal parts.
Same reason why if you have part time 4WD in a vehicle you should put upwards of 10 miles per month with 4WD engaged (just try to keep it to straight roads). Check your owners manual first, but every 4WD vehicle I’ve owned has recommended it.
This is definitely good advice for vehicle AC because like you said, it keeps the compressor seals in good shape. However it isn't as important for residential AC systems because they use fully hermitic compressors. There is no shaft seal that can fail. Depending on your outdoor temps, running your home AC in the winter can actually be very bad for it.
When it's cold outside liquid refrigerant will tend to settle in the compressor crank case that means when that compressor starts up it will immediately suck in and try to compress that incompressable liquid refrigerant. Depending on the compressor type this will drastically reduce it's lifespan or just straight up kill it. On systems designed to be used in cold weather there will be a crank case heater on the compressor to boil off any liquid refrigerant in the crank case. But if your system wasn't built with cold weather running in mind then it won't have one of those.
Today I Learned, don't run a house AC when it's cold.