Cooling & Heat Pumps
What Is a Heat Pump?
A heat pump is a system that moves heat rather than generating it, using a refrigeration cycle that can run in both directions. In summer it moves heat out of the house; in winter it reverses and moves heat from outdoor air into the house. One piece of equipment therefore provides both heating and cooling.
Also called: air-source heat pump · heat pump system
Why it matters to you
Heat pumps are the dominant choice across eastern North Carolina because the climate plays to their strengths — long cooling seasons and winters mild enough that the system rarely drops out of its efficient range. Because it moves heat instead of making it, a heat pump delivers more heat energy than the electrical energy it consumes, which electric resistance heat cannot do.
What to do about it
Expect a heat pump to deliver air that feels cooler than furnace air in winter — that is normal, because it supplies a larger volume at a lower temperature. If the backup heat is running often in mild weather, something is wrong with sizing, charge or the balance-point setting.
Common questions
- How does a heat pump heat a house in winter?
- It reverses the refrigeration cycle. Even air at 40°F contains usable heat energy; the outdoor coil absorbs it into cold refrigerant, the compressor raises that refrigerant's temperature, and the indoor coil releases the heat into the house. Capacity falls as outdoor temperature drops, which is why backup heat exists.
- Does a heat pump work on the coldest nights here?
- In eastern North Carolina, largely yes. Output declines with outdoor temperature, and below the system's balance point the backup heat supplements it. Because the coastal climate rarely sustains very low temperatures, a correctly sized heat pump covers most of the heating season on compressor heat alone.
- Heat pump or air conditioner plus furnace?
- A heat pump is one system doing both jobs; the alternative is two. On the coast the heating season is short enough that many homes are well served by a heat pump with electric backup. Where gas is already present, a dual-fuel pairing lets the heat pump carry mild weather and the furnace take over when it is colder.
- Why does my heat pump steam outside in winter?
- That is the defrost cycle. Frost forms on the outdoor coil in cold damp conditions, so the system briefly runs in reverse to melt it, producing visible vapour. It is normal and self-correcting. Continuous ice build-up that never clears is not, and should be looked at.
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