If you file in small claims for the nominal fee, [mine is 35$] Do you
really think Trane will fly in an atty for a day at considerable cost
and possibly loose 3000 and make local new hurting sales, or get your
furnace fixed.
I think they will fix it within 30 days. If they see your attemps to
alter it you are screwed. Start by a certified letter and many emails to
Trane and print copies. Video your interference issues-tests.

Maybe different organizations like FTC, FCC, CPSC, Consumer Reports,
etc can guide you on other complaints. This issue is not new.

RF I would think is regulated. Excessive amounts have to be of concern
of saftey for medical, security, and other equipment. Even if Trane has
figured a legal Out with the FCC, your local judge wont like it not will
Trane want to pay to go to court .