Although a geothermal system is more costly than an air source system, it will re-coup the difference in lower utility cost. And more important, most homeowners realize an immediate positive cash flow upon installation of a geothermal system!
In addition, some utility companies have financing packages that make the purchase of a geothermal system even less expensive. Still others provide special rates for homes with geothermal systems.
Because they use fewer mechanical components, and because those components are sheltered from the elements, leaves, dirt, and possible vandalism, geothermal heat pumps are durable and highly reliable. The underground piping used in the system often has 25- to 50- year warranties, and geothermal heat pumps typically last 20 years or more.
Geothermal heat pump systems have fewer maintenance requirements than most other systems. When properly installed, the underground components are virtually worry-free. The components in the living space are easily accessible, which increases the convenience factor and helps ensure that the upkeep is done on a timely basis.
Like a typical forced-air furnace or central air-conditioning system, a geothermal system uses ductwork. A geothermal unit is so quiet inside a house that users do not know it is operating: there are no telltale blasts of cold or hot air, depending on whether it's the heating or cooling season.
Geothermal heat pumps also improve humidity control naturally.