Hemp is one element that can contribute to an energy efficient house. As an excellent insulator hemp helps slow summer heat from passing through the walls. Hemp-lime is also a heat sink and holds warmth from the winter sun, releasing it during the night.
Many aspects affect the energy efficiency of a home, including:
Design with respect to sun angles
Creation of air flow for cooling
Other materials used in the build
Locations of windows and type of windows
Exterior shade including trees, eaves, pergolas and fences
Types of appliances used in the home
For more information on energy efficient design and building check out: