8.8K views · 147 reactions | #ASKMIKE How Does A Heat Pump Work? The easiest way to describe this is to look at a refrigerator or freezer. It moves heat from inside the box to the outside. A thermostat inside the box maintains a set temperature, so when the box gets warm, it starts pumping heat out of the box. When the box is cooled and reaches its set temperature, the pumping stops until it warms up again. Bosch Home Comfort | Mike Holmes | Facebook