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Is attic insulated? Is the ductwork from the furnace insulated in the attic?
At this point how much attic insulation would you say is there? 20 year old insulation has probably settled quiet a bit. Another question is if you have had the Trane techs check the unit to verify it is properly going into second stage when needed.These high efficient furnaces can actually be less efficient if not operating properly.
Hope they can verify an issue about staging maybe. I definitely would consider adding more insulation though either way .I feel that will help a lot.
i have 1200 square feet house and i need to replace my