This is one expensive thermostat. It may be inspired by Apple products but you could probably buy an iTouch and get an app to control the temp for less. http://www.nest.com/living-with-nest/index.html
The folks at Next Step Living came to my place to perform an energy audit through the Renew Boston program. This is completely free since we actually pay for this through our utilities like NStar or National Grid.
The audit was thorough, they answered all my questions. They took over an hour to examine for air leaks, water heater, a/c and appliances.
Manage your household energy use from any computer connected to the
Internet. The Vantage Portal is a browser-based Internet application
that delivers the tools and information you need to better understand,