Garry Sexton The GreyEdge Group

Phone: 870-373-0801


Thirty eight years of direct involvement in multiple aspects of engineering, design and consulting within renewable and alternative energy industries. Active work experience includes application engineering, sales and technical training, renewable energy designer, application/sales engineer, senior project management, product development, project creative concept design & development and founder/CEO of Innergie Technologies, Inc.

Career History

Innergie Technologies, Inc. Seoul, Korea & Shanghai, China
Founder, CEO 2007 - 2015
  • Established international renewable energy engineering consulting/design and HVAC heat pump distribution companies.
  • Developed Sales and Engineering Services Divisions within Korea with double digit annual growth.
  • Developed HVAC Sales Division for US Army projects in Korea
  • Built Engineering Design & Consulting Services for China and Korea
  • Providing onsite engineering HVAC support, project supervision, technical support, product engineering training for technical engineering staff
WaterFurnace International, Inc. Fort Wayne, IN, USA
International Sales Director 2004 - 2007
  • International engineering sales and marketing program for Asia-Pacific region
  • Developed and taught training courses IGSHPA certified training
  • Increased market sales by over 100%
  • Exceeded sales targets by 50%
  • Established and trained new distribution representatives throughout Asia-Pacific region
Co-Energy Group, LLC Las Vegas, NV
Senior Construction Manager 2001 - 2004
  • Managed a staff of 19 employees and three project managers
  • Directed the oversight and management of multiple subcontractors
  • Provided interface for US Military/DOD projects at locations throughout the United States
  • Provided technical and engineering oversight for large installations and mechanical HVAC systems totaling over $65 million in contracts
  • Completed projects on time and under budget - resulting in consistently satisfied customers
ClimateMaster International, Inc. Oklahoma City, OK
National Training Director 1999 - 2001
  • Established certified training program at ClimateMaster
  • Provided application engineering for distribution & dealer network
  • Developed sales and technical training seminars for USA/Canada
WaterFurnace International, Inc. Fort Wayne, IN
National Training Manager 1987 - 1999
  • Developed successful HVAC contractor training program for geothermal HVAC systems
  • Established and implemented training courses for Territory Sales Managers
  • Developed train the trainer geothermal technical sales programs
  • Recruited and trained staff technical training employees
  • Served WFI in positions as Territory Senior Territory Sales Manager and Application Engineering Manager
Blue Springs Engineering & Mechanical, Inc Kansas City, MO
Commercial Project Manager 1983 - 1987
  • Coordinated and managed commercial engineering and HVAC Installation projects
  • Supervised installation crew scheduling, job coordination and employees to meet project completion deadlines
  • Direct oversight of budgets and services for customer fulfillment and project specifications
Wilson-Linson Engineering, Inc. Springfield, MO
Project Manager 1978 - 1983
  • Managed in-house and field staff for HVAC operations including technical and contracting services
  • Coordinated estimation and bidding processes to secure contracts for two large hospital projects in Kansas City, MO and Harrison, AR
  • Scheduled and motivated employees to secure on time contract fulfillment

Past & Present Associations & Education



Garry is a native of Arkansas, USA and has participated in HVAC mechanical engineering projects for 38 years. He is the past CEO of Innergie Technologies, Inc. and has participated in the development of renewable and sustainable energy projects utilizing innovative technologies and has extensive experience with conceptual engineering design, project management and installation execution for projects throughout the USA, China and South Korea. His projects have ranged from industrial, agricultural and residential to large skyscrapers and include both private industry and governmental institutions. His responsibilities have included management of US and international sales and engineering teams, plus training and certification of geothermal designers and engineers.

During his career he served fifteen years at WaterFurnace in both domestic and international sales engineering, training director at ClimateMaster, and most recently CEO of Innergie Technologies, Inc. Innergie Technologies, Inc. was founded by Garry in 2007 with the goal of pursuing design and installation projects worldwide. His company engaged in several engineering projects for the US Military in South Korea and served as the geothermal heat pump SME (Source Matter Expert) for the US Army Corps of Engineers. His qualifications have included certification as the CGD (Certified Geothermal Designer) and Accredited Installation Contractor from IGSHPA (International Ground Source Heat Pump Association) guest lecturer for Tsinghua University, Beijing, China. Other certifications include ACCA (Air Conditioning Contractors of America) Certified Instructor, Type IV Universal Refrigeration Certification, Licensed Mechanical HVAC-R Contractor. He is actively involved in SAME (Society of American Military Engineers) and served as the post chapter vice president for South Korea from 2011-2015. (Garry sold his company, Innergie Technologies, Inc. in 2015)

Engineering Design and Consulting Engineering Projects List

Changzhou Pharmaceutical Office & Manufacturing Complex, Changzhou, China Closed Loop Ground Source Heat Pump System, Capacity 1,150 Refrigeration Tons, 356 Vertical Boreholes, HX Depth 500’

Media Center 2008 Olympics, Qingdao, China (Qingdao Harbor) Open Loop Seawater Source Heat Pump System, Capacity 550 Refrigeration Tons, Titanium Plate Heat Exchangers (primary/secondary isolation pumping configuration)

China Expo 2010, Shanghai, China (Huang Pu Jiang River) Open Loop River Water Heat Pump System, 9,860 Refrigeration Tons, Stainless Steel Plate Heat Exchangers (primary/secondary isolation pumping configuration)

Lotte Tower, Seoul, Korea (123 story office/retail/residential)

Guacheon National Science Museum, Seoul, Korea Closed Loop Ground Source Heat Pump System, Capacity 450 Refrigeration Tons, 130 Vertical Boreholes, HX Depth 660’

Seoul City Hall, Seoul, Korea Closed Loop Ground Source Heat Pump System, Capacity 1,030 Refrigeration Tons, 280 Vertical Boreholes, HX Depth 670’ (boreholes located under building footprint)

Busan University Hospital, Busan, Korea

Communication Center, Camp Humphreys, Pyeontaek, Korea (Hardened Facility Located Underground N+2 primary/backup/backup)

Daegu Bachelor Officers Quarters, Daegu, Korea Closed Loop Ground Source Heat Pump System, Capacity 250 Refrigeration Tons, 80 Vertical Boreholes, HX Depth 672’ (200 RTons heating/cooling – 50 RTons hot water generation)

US Army Airbase K16, Seongnam, Korea (First Phase - Airbase Retrofit to GSHP Systems) Closed Loop Ground Source Heat Pump System, Capacity 580 Refrigeration Tons, 175 Vertical Boreholes, HX Depth 660’