[RFI] Getting a Gas Furnace, and Electric AC unit...

Jim Brown jim at audiosystemsgroup.com
Mon Aug 13 08:41:22 PDT 2012

On 8/13/2012 8:23 AM, David Robbins wrote:
> i have lennox heaters and they don't put out anything i can hear... so in general, no, they don't put out rfi.

With all due respect, David, a sample of one (or even a few) is hardly 
justification for saying that a an entire manufacturer's product line is 
free of RFI.  Indeed, many product lines that have been free of problems 
in the past are becoming nasty interference generators when variable 
speed drive motors are incorporated in the design.  Sadly, this is 
becoming increasingly common in the name of energy efficiency.  One 
needs to look no further than a post by Mel Crichton about his Samsung 

It would be far more useful to know exactly the model number and vintage 
of the unit that you find problem-free.

73, Jim Brown K9YC

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