I think the ones that cause the problems are the real high efficient type 
like 98 percent.  They use a D C motor for part of the injection or 
something.  I have one.  73 Ed K7UC

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From: "John Miller" <[log in to unmask]>
Sent: Tuesday, June 21, 2011 11:47 AM
To: <[log in to unmask]>
Subject: Re: line noise and causes

> That's true for just a bout everything these days. I've never had a 
> problem
> wit a furnace causing noise though.
> ----- Original Message ----- 
> From: "John Sherrer" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Tuesday, June 21, 2011 1:17 PM
> Subject: Re: line noise and causes
>
>
>> The parts made for all furnaces and Central Air are made by the same
>> company.  The only difference between companies is the outside sheet 
>> metal
>> and warranty.
>>