Types of Heat Pumps. The most popular type of heat pump is an air-to-air heat pump, or air-source heat hump (ASHP). These are often mounted to the interior of a wall and used mostly in moderate climates, as performance can lag when temperatures get below 35 degrees Fahrenheit. heat pump is equipment that uses a refrigerant to move heat from one place to another. During the summer, a heat pump captures heat from inside a home and transfers it to the outdoor air through a condensing unit.