The average air-source heat pump is like an air conditioning unit, with a few extra parts thrown in. A heat pump works by pumping heat out of your home when in cooling mode and pumping warmer air into your home while it's heating. It pumps cooler or warmer air from the outside air directly to the air compressor, increasing energy efficiency dramatically.
Geothermal heat pumps work in the same way except instead of pumping hot or cold air from the outdoors into the compressor; it pumps the ambient air from a series of underground coils. The underground temperature remains steady in all areas, even in the most extreme temperature regions of the world, making a geothermal heat pump the most energy efficient of all heating and cooling systems.
<a href="http://www.cleanairheat.ca/heating-and-cooling-mississauga.php">Heating and cooling </a>