I looked when I first started and couldnt find anything that did everything I wanted it to for an existing home audit. Recently there has been some promising looking software that has or will be released soon. Check out Optimiser, by Energy Logic and Recurve software by Recurve. These two look promising. The big negative for both of them is that you have to pay use fees instead of being allowed to purchase the software. I believe I like the Optimiser software better for existing home audits for its customization and weather normalization features. Check them out and let me know what you think. I'd love to know if there are any others out there as well.
Yes, I can present a polished report to the homeowner on my first site visit. It takes some additional time to prepare. Depending on the size and complexity of the home's geometry and systems, a pretty thorough home analysis can take 2-4 hours, with another 30-60 minutes for report preparation.
If you are computer science (ie programming) savvy, you can also set up pricing in the same software, so you are able to present an accurately priced contract for the homeowner to sign at the same time. After the initial investment in programming (which can be a few hours or many days, depending on the complexity and quantity of improvements you want to include), that adds another 15-30 minutes to the time at the residence.
Here is HEAT on the app store:http://itunes.apple.com/us/app/heat-professional-home-energy/id4261...
Greattest is not a modeling tool, but what they are calling an integration tool. We are in Delaware and work in 4 states under perhaps 7 programs, each with a different modeling tool - Beacon, etc. Greattest is a program that allows you to see the same audit pages to fill out each time, so learn it once, then just download the results into the various modeling software - no learning the various programs and hassling with them - anyone who has used Beacon knows what I am talking about. In addition, spending an extra 3/4 hour or so at a house, you can leave the HO with a report on your way out the door - done.
I think that is where the skill & care of the home analyst come into play. Those factors you mention are how I sell jobs, the energy efficiency is usually just a convenient side effect. I think the main purpose of a home analysis is to have enough data for the homeowner to make appropriate decisions regarding their priorities. If I find a water heater spilling CO everywhere, I don't want to tighten the home before addressing that health concern. In my view, health always trumps everything, and depending on the client, comfort usually trumps energy efficiency.
I don't know of any software that could effectively tell me why I'm cold by my crappy old windows, but a knowledgeable expert in my home who cares about me could explain the phenomena of radiant heat transfer and convective loops.