There are many features that can be included in a new home to make it more energy efficient. 

Building Green—features from HCS Builders
 
o   Energy Star built and certified homes
o   R-50 attic insulation
o   2x6 exterior walls with R-19 insulation, higher R value available
o   Insulated exterior entry doors
o   Air-to-air exchanger-HRV unit for improved indoor air quality and humidity control
o   92% or 95% efficient furnace
o   Geo-thermal or heat pumps available
o   Programmable thermostat
o   Energy Star rated dishwasher
o   Low maintenance exterior products
o   Tyvek house wrap- added protection from air infiltration and severe weather
o   Pella windows- Low-e coating and argon gas filled for superior performance
o   Erosion control to keep silt off streets and out of sewer systems, streams, and lakes
o   Entire yard sodded to eliminate silt run-off



Alternative Building Materials
http://www.powerhousetv.com/Building/Alternative/index.htm