Troubleshooting heat pumps, heating systems, and central heating and air solutions for home heating. A heat pump is a device that is able to transfer heat from one liquid at a lower temperature to a higher temperature. Heat pumps. These units pull out of the ground or outside air temperature to heat and cool your home to perfection. Reliable, and low-temperature range and high modulation, which means the compressor may be amended, and maximize the efficiency of a heat pump for outdoor temperature is selected.