Efficiently Sustainable Products Onsite generation of renewable energy through solar power, wind power, hydro power, or biomass can significantly reduce the environmental impact of the building. We specify high-performance windows and doors, insulation in walls, ceilings, and floors. During the design and construction process choosing construction materials and interior finish products that will help increase the overall longevity of our living. Products that reduce emissions within our atmosphere as well as products that improve emissions within our homes. Working with New Zealand Green Building Council knowledge, Evergreen Homes and Construction produce Green Star quality homes and communities. Tip: The use of wood products can also improve air quality by absorbing or releasing moisture in the air to moderate humidity.