Over the years, I've had 2 different HVAC repair men come to my house,
and I've been told contradictory information. Who do I trust???
I mentioned my ridiculously high electric bill to the first repair man
(roughly $400/month for an 1800sq.ft house). He suggested that I
should leave the heat pump fan on ON all the time. His logic was that
it would keep the air ducts dry and cool, so that when the pump comes
on it doesn't have to work as hard to cool the house.
I've done this for several years, and while I didn't notice a change
in my electric bill, I assumed that the heat pump was running more
efficiently and would last longer, anyway.
Recently, the reversing valve went out on my heat pump, and I had to
have a different repair man come out to fix it (the guy that came out
years ago has since retired). He asked why I had my fan on, and I told
him the explanation that the other repair guy gave. He said that that
was entirely incorrect; the fan being on all the time could raise my
electric bill by as much as 25%!
So, who's right? Should I leave the fan on, or put it on auto?