Able Environmental - Offers products and services about home heating using earth-based technologies.

ClimateMaster, Inc. - Designs and manufactures water source heat pumps. Provides an overview of geothermal product lines for residential and commercial applications; download of literature library; parts and accessories; and contact details. Based in Oklahoma City, Oklahoma.

Econar Energy Systems, Corporation - Manufacturer of geothermal heat pumps. Includes case studies, publications and manuals.

ECR Technologies, Inc. - Manufacturer of EarthLinked, eothermal, geo exchange, ground source heat pumps.

Enerflow Technologies CC - Designs and manufactures heat pumps and hot water systems. Overview of products and services, company background, past projects, and contact details. Based in Potchindustria, Potchefstroom, South Africa.

FHP Manufacturing - Manufactures only water source heat pumps.

ICE Energy Ltd. - UK suppliers of IVT ground source heat pumps and provide a complete supply and installation service for the ground loop and the heat pump.

Jones Home Comfort, Inc. - Supplier of the Water Furnace line of geothermal heating and cooling units for residential, commercial, or government customers.

Middleton Sales Company - Distributor of Florida Heat Pumps and provides swimming pool heaters.

Water and Energy Systems Corp - Geothermal heat pump and geoexchange system design and distribution company serving the Northeastern U.S.A.

WaterFurnace International Inc. - Manufacturer of ground source geothermal heating and cooling systems for the residential and commercial markets.