We used to say that while asking a question to experts, you would receive as many answers as experts you ask your question to. No reason to be different in Energy Efficiency. Thus, Energy Efficiency engineers would legitimately give different answers depending on their own expertise (metering, automation, thermal, electricity and so on) and on the firm/product line they belong to.
My personal answer based on field experience is the following: You should start your Energy Efficiency project certainly not with an offer! Neither an audit, nor a metering systems’ installation. You should start it with questions and a genuine ability to listen to your client’s answers. Finally, this is basically a regular sales approach sometimes some engineers tend to negligate a little bit too much.