Heating installations with natural air movement (natural convection):
(a) aerial pipe heating
(b) bench heating
(c) low-position heating pipes for aerial heating
(d) soil heating - heating installations with forced air movement (forced convection)
(e) lateral position
(f) aerial fan
(g) high-position ducts
(h) low-position ducts
Motivation: Cost Benefits
As stated in the US Department of Energy: Energy Efficiency and Renewable Energy website: "Idaho provides individuals with income tax deductions for alternative energy devices installed in their homes. Qualifying devices include renewable energy systems using geothermal resources such as geothermal heat pumps and water source heat pumps. The entire cost (100%) of the residential geothermal energy system can be deducted from the taxable income up to a maximum of $20,000. However, the deduction cannot exceed $5,000 in any one year. Forty percent of the total cost to construct and install the system can be deducted in the year the device was put into service, and 20% for the next three years. Contact http://www.tax.idaho.gov for details" (http://www1.eere.energy.gov/geothermal/gpw/profile_idaho.htm par. 12).
Motivation: Environmental Benefits
As with any natural resource, the potential of over exploitation is real, note however, that when geothermal heat is used in a sustainable manner the impact on the environment can be diminished.
The table below was found at: http://iga.igg.cnr.it/geo/geoenergy.php where they sited the original source as Lunis and Breckenridge (1991). As the International Geothermal Association notes, the "probability and severity of potential environmental impact of direct-use projects" [Geothermal] range from low (L), moderate (M), to high (H).
| Impact | Probability of Occurring | Severity of Consequences |
| Air quality pollution | L | M |
| Surface water pollution | M | M |
| Underground pollution | L | M |
| Land subsidence | L | L to M |
| High noise levels | H | L to M |
| Well blow-outs | L | L to M |
| Conflicts with cultural and archaeological features | L to M | M to H |
| Social-economic problems | L | L |
| Chemical or thermal pollution | L | M to H |
| Solid waste disposal | M | M to H |
The Green Triangle Indicates "Greenhouse" Use
The Turquoise Diamond Indicates "Space Heating" Use
The Red Dots Indicate "Wells > 50 Degrees C.
The Blue Dots Indicate "Wells > / = 20 and < / = 50 Degrees C.
Idaho Geothermal Resources Map Publication No. - INEEL/MIS-2002-1618 Rev. 2 November 2003
As you can see from this chart, there are many sources of "hot" water in our area. And as indicated in my previous post, we are one of 200 homes already connected to the geothermal heat source... This should make our job of converting the back yard into a year-round produce growing hotspot a little easier.
