Emergency heat is the setting that shows that your heat strips are activated. Sometimes people do not wire up the heat strips at all as the use a great deal more power than the normal heat pump uses. The problem is that a heat pump comes to a point where it is not efficient at about 28 degrees and this is where you need the heat strips or if you want to heat the house quickly which a heat pump will not do. Heat strips are located in the ductwork and act like a space heater. A H/A tech is probably needed to check this stuff out for you.
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