Pros : Not as expensive as the water to water units, and almost as efficient.
Cons : Requires ducting or other means to distribute warm or cold air from the interior heat-exchanger to other parts of the building.
Efficiency : Between 3.5:1 and 5.0:1; ie. 3.5kW of heat output requires 1.0kW of electricity input, depending on ambient air temperatures.
Geo Thermo Dynamics, based in the New South Wales Snowy Mountains, is the only Australian owned and operated ground source heat pump installation company in Australia (to the best of our knowledge). All of our systems are Australian designed, manufactured, and installed.