Lead Performer:  Stone Mountain Tech. Inc. – Johnson City, TN
-- Ingersoll-Rand (Trane) — La Crosse, WI
-- Gas Technology Institute — Des Plaines, IL
DOE Total Funding: $1,881,537
Cost Share: $811,789
Project Term: September 2017 — September 2020
Funding Type: Buildings Energy Efficiency Frontiers & Innovation Technologies (BENEFIT) – 2017 (DE-FOA-0001632)

Project Objective

Stone Mountain Tech. Inc. is developing a gas-fired absorption heat pump that offers a significant advancement for space and water heating technologies when compared to conventional gas heating technologies (an Annual Fuel Utilization Efficiency (AFUE) of 140% versus 100%, respectively). This heat pump will provide efficient space and water heating for single and multi-family homes in most climate zones. This fuel-driven solution utilizes a simple single-effect ammonia-water absorption cycle.

Project Impact

This technology has the potential to reduce heating costs by 30-50% because of its COP of 1.45 at 47°F and -13°F. It is projected to have a total energy savings of 1596 TBtu for 2030, a total CO2 savings of 91 MMT, and a simple payback of 3.8 years.


DOE Technology Manager: Antonio Bouza
Lead Performer: Mike Garrabrant, Stone Mountain Tech. Inc.

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