We did the [energy] audit several years ago; definitely worth the $100. You will get a comprehensive review of your home: includes appliances, HVAC, Insulation, Venting & Ducts, Windows, Doors, Outlets. The report is approx. 30 pages; you will find out how your home scores against current standards and goals. At the end; suggested fixes are prioritized, identifying the best/fastest return on your investment if you choose to fix any issues. We used DeVere [Insulation Home Performance] to do the audit (we re-insulated our home – they did the insulation and re-test to satisfy BGE’s rebate). After the audit is complete and you know the problem areas – check BGE’s website for rebates. We saved $2000 (through rebates). We have cut our energy costs by 33% while removing ‘hot’ & ‘cold’ zones in our home.