Geothermal

• When to Use a Heat-Pump Water Heater (Subscriber content)

  Q: A customer wants me to install one of the new heat-pump water heaters in the ground-floor utility room of a house built on a slab. I don't have any direct experience with them, but since they work by drawing heat from the surrounding air, won't any energy savings in the winter be at least partly...

   
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  Geothermal System

  Climatemaster. The Tranquility 22 Digital series geothermal system has one of the smallest footprints in the industry, making it ideal for retrofit projects or installation in tight spaces, the company says.

   
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  Cypress Series Geothermal System

  GeoStar. The Cypress Series geothermal system provides forced-air heating and cooling and hydronic heating for radiant floors and features a desuperheater option for supplemental hot water.

   

• High-Tech Maine Heat Pump Maker Fails, but Questions Remain

   
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  Geothermal Sources: The Blessing and the Curse (Subscriber content)

  Free underground heat

   
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  Net Zero House for a Cold Climate (Subscriber content)

  An architect shares his plan and process for building a northern Vermont house that produces as much energy as it consumes.

   

• The 2010 Readers' Choice Green Finalists

   

• Letters

  Post-tension cables; fire damage; wrong railing test; skilled workers; radiant and geothermal; more

   
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  Ground-Source Heating & Cooling Gets Better (Subscriber content)

  Direct-exchange heat-pump technology is pushing energy efficiency through the roof, and because it requires far fewer feet of ground loop, systems can be retrofitted even on small lots.

   
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  Air Conditioning for Humid Climates (Subscriber content)

  Balancing cooling with humidity control is a tough job in the coastal South. A North Carolina hvac pro explains how the latest generation of cooling equipment meets the challenge.