1. SUCCESS WITH GEOTHERMAL HEAT PUMP SYSTEMS IGSHPA 2008 - NASHVILLE Image Engineering Group, Ltd Don Penn, PE, CGD www.iegltd.com © IEG, LTD 2008

2. PREFERRED WELL FIELD DESIGN  Vertical Wells  Advantages  Requires least amount of Land  Least amount of total piping  Least amount of Pumping Energy - less than 25 feet of head.  More Consistent Ground Temperature versus Horizontal Well Fields  Well Field square footage similar to square footage of space being conditioned.  Vertical Wells  Advantages  Requires least amount of Land  Least amount of total piping  Least amount of Pumping Energy - less than 25 feet of head.  More Consistent Ground Temperature versus Horizontal Well Fields  Well Field square footage similar to square footage of space being conditioned.

3. ROACH MIDDLE SCHOOL WELL FIELD LOCATIONS

5. TYPICAL INSTALLATION OF GEOTHERMAL SYSTEMS  Use HDPE for Piping thru out  NFPA Classification of “Non-Flammable or Combustible”.  Metal in Systems is limited to Pump Housings, Valve Bodies and Water to Refrigerant Heat Exchanger in GHP.  Use V-Track hanger to provide neat orderly installation and eliminate pipe sagging.  Individual Pump(s) per GHP  System Operates between 30 and 45 psi.  Use HDPE for Piping thru out  NFPA Classification of “Non-Flammable or Combustible”.  Metal in Systems is limited to Pump Housings, Valve Bodies and Water to Refrigerant Heat Exchanger in GHP.  Use V-Track hanger to provide neat orderly installation and eliminate pipe sagging.  Individual Pump(s) per GHP  System Operates between 30 and 45 psi.

6. FRISCO ISD SCHOOLS MECHANICAL COST COMPARISON CAMPUSYEAR BID SQ FTMECH COST* $ / S.F. Bright Elem200171860$968,922.00$13.48 Spears Elem200271555$970,621.00$13.56 Riddle Elem- Geo200372848$981,284.00$13.47 Pink Elem-Geo200476000$1,054,261.00$13.87 Pioneer Middle2001137245$1,676,435.00$12.21 Wester Middle2001137245$1,676,435.00$12.21 Griffin Middle - Geo2002138651$1,679,000.00$12.11 Roach Middle - Geo2004138650$1,709,000.00$12.33 - Includes Controls and Condensate Drains / Costs are not adjusted for inflation or escalation - 2006 Costs are $15 to $16 per square foot

7. BIRDVILLE ISD SCHOOLS COMPARISON - YEAR 2000-2001

8. FRISCO ISD ELEMENTARY SCHOOLS COMPARISON - YEAR 2005-2006

9. FRISCO ISD MIDDLE SCHOOLS COMPARISON - YEAR 2005-2006

10. FRISCO ISD HIGH SCHOOLS COMPARISON - YEAR 2006

11. Richland Middle School Areas previously without HVAC

12. RICHLAND MIDDLE SCHOOL - BISD Geothermal System Installed in 1995