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Green Research Results in New Geopolymer Concrete Technology
Geopolymer concrete has the potential to substantially curb CO2 emissions, produce a more durable infrastructure capable of design life measured in hundreds of years instead of tens, conserve hundreds of thousands of acres currently used for disposal of coal combustion products, and protect aquifers and surface bodies of fresh water via the elimination of fly ash disposal sites. Continue...  View Topic

The Guide to Home Geothermal Energy
All HVAC systems require energy-intensive heat movement, a task responsible for over half of the average house’s total energy demand. Geothermal works more efficiently because the system’s mild starting point creates an efficient shortcut to the target temperature. Imagine a 100-degree Florida day or a 0-degree Michigan night: Spot the system 50 degrees, and it doesn’t work so hard to get the house comfortable. Continue...  View Topic

Making Net Zero Energy Living a Reality
Professor Moomaw has served for the past 15 years as a member of the Intergovernmental Panel on Climate Change, a position through which he has accumulated a vast amount of knowledge about renewable energy and energy efficiency. Though in their previous home, he and his wife had taken steps to reduce energy usage by two-thirds, Professor Moomaw knew there were many more things which could be incorporated into a new home to make it much more energy efficient and to potentially produce as much energy as it consumes, i.e. a net zero energy home. And that is what he and Margot set out to do when they planned their Williamstown home. Continue...  View Topic

ICF Forum 
Cost of ICF Construction
ICF's and Clay "plaster" walls. Anyone use this stuff?
Attaching things to ICF walls (outside)

SIP Forum
Vented vs. Ventless gas fireplace in SIP home
PU SIP vs. PU spray foam?
Structural capacity

Radiant Heating Forum
Kicked out my plumber... hope I wasn't overreacting
Radiant vs. forced air
Can I use PEX for solar panels?

Geothermal Heat Pump Forum
What’s wrong with my neighbors system?
Does geothermal pay? 
Questions on possible geo HP upgrade

Solar and Wind
Solar hot water vs. PV quandary
Compound parabolic solar panel 
BP solar panels

Windows/Doors and Interior/Exterior Finish
Milgard Fiberglass Windows
Need Porch Decking Ideas
Window Efficiency

Appliances, Lighting and Kitchen/Bath Fixtures
Quietside dual purpose water heater DPW 099A, any good?
Front load washer better or not?
Granite and radon - yikes! 

Green/Energy-Efficient Design and Planning
Passive Cooling Ideas
Graywater system / septic?
Basement heating options

Green/Energy-Efficient Building and Construction
Which type of roof construction is better....?
Cinder block house - vapor barriers
HVAC and Insulation Input for New Home Appreciated

General Forum
GREEN Back-up Generator
Wood stove upstairs and pulling heat downstairs
Rock to use under garage and driveway