I am not thrilled with the alliance, but I think it will help raise the awareness of the need for energy audits and assessments. Unless you're in the industry, who knows who RESNET is anyway?
My main concern is a lack of control by Home Depot to police contractors and their quality of work. For example, in my previous profession, I did class action suit and warranty inspections on building products. One of the products I inspected was for a high end door manufacturer. In over 100 warranty claims for that company, not one of them was failure due to product. All the issues were related to the installation process and 75% of the installers came through Home Depot. If HD has a quality control concern, I have never seen it.
In speaking with friends and family, they are also leery, because a lot of them associate Home Depot with cheap. But for the same token, many of them believe that people see them as the "home improvement experts". Some efficiency improvements can be performed by the homeowners, but if they are not performed properly, what kind of problems are they going to create?
Either way, if they are going to do this, they need to involve or reach out to people that are currently trained and experienced. If HD is just going to "train" people to walk through a house with a clip board, RESNET themselves will lose credibility.
Quantity can never compete with quality. I'm in the HVAC industry and 70% to 80% of our business is repairing and redesigning poor workmanship so I'm never intimidated by big boxes.