I have 2, 4 ton Lennox HVAC units here...1 on each side of the house. One is about 6' from my west facing shack window. I have no audible interference from either unit.

Milt.

N6MG

070-650

LONP #76

Rick
My 10yr old Lennox G71 furnace will be replaced on Tuesday with a Lennox SLP98 due to a flood.
It comes with a "no RFI" guarantee.
GL de Barry