I’ll agree with that option, as well.
These simple calculators serve the purpose of introducing home owners to the tip of the iceberg … but while providing basic tips on appliances and behavioral patterns, they do not provide the home owner with enough reliable and relevent information to actually “rate” or to affect changes to the home’s structure, ventilation or mechanical features.
For that reason, and considering the “estimate” that could result in the rating being off by up to 40%, an inspector should carefully consider all of the possible ramifications of having the decision to buy or pass on a home that is based upon the* “rating”* that he provided with his “estimate”.
ASHI has already jumped into the gamein a big way. The problem for them is that the DOE Home Energy Score partnership that they are a part of is actually being protested and lobbied against by the NAR who object to having houses officially government “rated” and interfering with their sale.
It is possible that the DOE’s Home Energy Score program may not see the light of day. It was originally slated for implementation last Fall, then again this Spring … and now, seems to be in limbo. It has no support from home owners, home sellers, home buyers and those who represent them. They have yet to recruit sufficient participants to provide these "scores" outside of California and New England. It’s not looking good and will likely get worse when and if it is ever implemented.
This InterNACHI thing, on the other hand, is already an available option and does not carry as much of the same stigma as an offical government rating … and inspectors who are not certified energy professionals can still provide a meaningful alternative, if marketed for what it is and not more than what it is. They can simply ally themselves with a BPI or RESNET certified inspector to refer their client to for additional evaluation when issues beyond the routine need for CFLs, EnergyStar appliances, etc are detected. In this way, They can provide the same or better service to a greater number of people.