Water to Air Heat Pumps

Water to Air

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.