Recently I replaced my wood-burning heater with a split-system heat
pump with a variable speed blower. Formerly the airflow direction was
UP and through ducts in the attic. With the new system I had the
contactor reverse the airflow, so that it's now DOWN and through
ducts that were formerly used for return air. These ducts are embedded
I the concrete slab. Problem: the air temperature exiting the new
supply resisters is never warm enough, even when the auxiliary heater
(electric resistance) is running. I fear that the concrete is absorbing
too much heat. In fact, there are places in the house where the floor
is noticeably warmer than most. Does his sound correct? If so, is there
an insulation product that I can install in the ducts (round PVC)?
lucky for you, there IS a solution to your problem. Its not
inexpensive, but like I say, there is a solution. Actually you have
several choices to chose from. At least 3 solutions come to mind.
How many $$ is in your budget?
New info: The contractor had not completed the job. It turns out that
the old return (now supply) ducts had NO plenum. The blower was blowing
all my hot air into a very large undefined space below the fireplace
and heating massive amounts of concrete blocks, heavy-gage steel, and
stone before entering the ducts. And there were many leaks. Once he
added a plenum and sealed off all the leaks, the situation is much
better, but not great in all areas of the house.
My decision to insulate some of the ducts will depend on the cost to do
it. Can you give me any idea of the costs?
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