It is actually an easy business to start. The requirements you need are provided through the training courses which we have reviewed. Your level of "technical expertise" is such that you do not need to have a background in the construction trades, inspection business or engineering.
It's a business which you follow a dedicated course of events (survey) which has in turn a prescribed listing of energy efficiency upgrades. As you conduct the survey of the home or business you follow the different topics on the survey. These efficiency topics lead you through the property and you note what is there and possible upgrades and then relate that to your client at the end of the survey.
It is as easy as that. Now realize, you get paid to show folks how they can save energy by making simple changes! Surveys and audits can bet more technical. And that is one of the areas which the training programs which we reviewed and recommend cover extensively. They offer both basic training and upgrades as you grow your business.