Heat pumps are great. Instead of using a separate air conditioner and furnace to manage your comfort around the year, you only need a single system that can provide heating and cooling. And it works the same way, no matter if it’s in heating mode or cooling mode: the only difference is the direction the refrigerant moves. In one direction, the refrigerant moves heat from inside and releases it outside (cooling). In the other, it moves heat from outside and releases it inside (heating).
We’re at the time of the year when you’re going stop using the heating mode on the heat pump, and will eventually change the setting on the thermostat to “cooling.” But what do you do if you change your heat pump over to cooling—and you don’t get cool air from the vents?