Here are some resources:
Affordable Comfort (ACI) — holds an major annual conference, and provides training and information on cost-effectively implementing home energy savings.
American Society of Home Inspectors (ASHI) — some homeinspectors have the skills to help assess energy efficiency opportunities.
Association of Energy & Environmental Real Estate Professionals (AEEREP) — this professional association provides green market education to the real estate community. Members receiving the EcoBroker designation assist in educating consumers about energy savings and environmental decisions in the purchase and ownership of real property.
Building Performance Institute (BPI) — Offers training, certification, accreditation, and quality-assurance programs for making homes perform well in terms of energy, safety, and comfort.
The California Energy Commission — Their Quality Homes website outlines best-practices in implementing high quality home envelopes and systems, as well as protocols for quality assessment.
Home Performance with ENERGY STAR — The whole-house systems approach takes shape under this program, a national initiative from the U.S. DOE and U.S. EPA.
Residential Energy Services Network (RESNET) — RESNET Ratings provides a relative energy use index called the HERS® Index — a HERS Index of 100 represents the energy use of the "American Standard Building" and an Index of 0 (zero) indicates that the Proposed Building uses no net purchased energy (a Zero Energy Building). A set of rater recommendations for cost-effective improvements that can be achieved by the Rated Building is also produced.