My general feeling on this is yes, if you get a truly independent unbiased auditor.
- Look for someone that is BPI certified (Building Performance Institute) and performs an audit to that level/standard.
- They should not be giving you product recommendations but identifying problems and offering generic solutions to fix those problems.
We do energy auditing as part of our comprehensive green design, build, product services but I alway hire an independent auditor that is BPI certified.
The recommendations will likely identify a laundry list of potential opportunities to reduce energy costs. It should include an estimate of expense, savings, and payback if it is a good audit.
There are good and bad consultants out there so be careful to screen their credentials and ask for samples of other audits they've done and references to call.
For more information:
Read "I keep hearing that I should get a home energy audit. What should I expect to pay and expect to get?" a Q&A answered by Steve Saunders.