Q: Do heat pumps remove humidity in the air?

A: Yes, when in cooling mode. In New England the only time we need dehumidification is in the summer when the heat pumps are operating in cooling mode, but in Seattle where is it cool and humid you might still need a dehumidifier in winter, although some heat pumps (my Bosch ones for instance) will temporarily go into cooling mode even in winter time if they need to to reduce the humidity.