>I'm curious -- why should there be lots of EMI? AIUI, these units
>tend to use induction motors exclusively, for both compressor and
>fan, which are fairly "clean" as far as EMI goes.

I tend to work on the basis that such units have big fat cables, so if they 
are not generating EMC/EMI themselves, then there is a big conduit bringing 
such interference from somewhere that does generate it, and radiate where it 
is not wanted. 

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