Heat pumps use electricity to operate; they extract heat from the air and transfer it to the pool water.

In summer, a refrigerant is compressed and condensed to extract heat from a house, just like a refrigerator.

They at least generate their own muscular energy by extracting heat from the air they breathe.

Heat pumps provide winter heating by extracting heat from a source and transferring it into a building.

Phase change materials can be designed to extract unwanted heat during the day, and release it at night.

The slush extracted heat from bodies accustomed to equatorial waters.

Also the switching fluid inside the roof can be circulated to extract heat from the greenhouse.

Geothermal energy can also be obtained by piping water underground to extract heat from hot, dry rocks.

Plus, their design can extract heat 3 to 5 times faster than traditional water-based systems.

Cool air warms as it passes through into the lungs, extracting heat from the nasal region.