1) If you had PL noise while your HVAC was cycling, how would you filter that out?
2) I [successfully] have always used 15a filters http://www.smarthome.com/4845ACF/ACT-AF120-15-Amp-Plug-In-Noise-Filter/p.aspx
on UPS's and laser printers, to filter OUT
noise before it reaches the PL.
would placing a filter on the receiving end of a problematic device do anything?
Also, the above mentioned link talks about X-10 signal noise. Are Insteon noise issues the same as X-10 noise issues?