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I will have to ask you a lot of questions, if you can answer them we have a good chance of sorting this out for you.
Tell me what happens after the heat pump shuts but the blower keeps running... there are some fine details I need here. 1. how far does the house cool off and how long does it take. 2. Does the outside unit stay off after that. 3. What do you have to do in order to get the heat back on, and does the outside unit run after you do that.
I am asking because these systems use the outside unit for heating and also if that fails have back up electric heat...I need to sort that set of details out.
Next tell me what the $4,000 bought you, all new duct work, air handler or furnace, and the heat pump outside? or just some of that.