They’re the same core concept. There are generally two major differences: * a heat pump has a switch valve for coolant. This allows it to move heat in either d

They’re the same core concept. There are generally two major differences: * a heat pump has a switch valve for coolant. This allows it to move heat in either direction. * while not strictly necessary, heat pumps typically have a variable rate compressor. They scale to match load. Some heat pumps will also have a supplemental electric heat element when conditions are extremely cold.