When you turn up the thermostat to combat the cold of a Marshfield, MA Winter, and you can’t feel warm air blowing from your vents, it is probably time to schedule a heat pump repair with Blue Bear Plumbing.. If your HVAC unit was working well over the summer, it might just be time to have an annual heat pump service call to do a tune-up. It could be something as simple as a lack of refrigerant or a belt that needs tightening. It is important to call as soon as you notice an issue so your home stays comfortable when the temperature drops below freezing.