But if you use it, your unit runs the risk of toggling unnecessarily between heating and cooling. Your heat pump will run most efficiently when set to “HEAT” in winter and “COOL” in summer. Note: “AUTO FAN” is a separate setting, and fine to use.
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Does a heat pump fan run all the time?
The fan only runs when the system is on and not continuously. There is better dehumidification in your home during the summer months. When your fan is set to AUTO, moisture from cold cooling coils can drip and be drained outside. If your fan runs continuously, moisture does not have a chance to drip outside.