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Ralph Mowery

In article ,
says...

You could certainly add some output to a room or two if it's feasible.
I'd first carefully measure the temps in various areas. If they are
all about the same, then making one area significantly better will
just make the other areas worse. You could check around, get some
recommendations for good HVAC guys and get a couple over for evaluation,
starting with seeing if the existing system is operating correctly.

The heating/cooling systems I have seen usually have
dampers/flaps/valves or whatever you call them in the ducts where you
can adjust the air folw to different rooms to help ballance the air
flow.