I attended a seminar on GeoThermal H&V yesterday pushing the Trane
units. They use a variable speed fan that sounds like it may be
controlled by pulse width modulation.
I asked if they would guarantee no RFI and the salesman said he'd have
to get back to me. He's coming out Friday to give me a quote, but they
know I'm not interested in even trying it if they can not give me a
written guarantee ahead of time.
It seems like Trane came up on here a while back but I've been unable to
find a reference to it.
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