But what I'm hearing from this thread is you need to get an inspector/builder who knows the answers to these issues, but no one seems to agree on what the correct answer is.I would start by learning about homes. Learn the basics - get a book such as "Encyclopedia of Home Improvement" or "Carpentry and Building Construction". They will get you started on the basics.
You'll find that there are various theories on such issues as whether to use a vapor barrier or not and whether to seal the attic or leave it ventilated (yes, there are advocates for a sealed attic scheme). Understanding the basics helps you understand how these theoretical schemes are supposed to work.
Also, a couple of the links that were presented here by Restorer and others provide a host of good information. Read them as time allows and you'll be better equipped to deal with inspectors. You may even point out a few things to them to let them know that you're not just another pretty face. :^)
A voice of reason. Thanks. :-)
I gather you live in the South.
Let me recommend a product which has proven highly effective in retrofitting many structures in hot/humid climates.
http://www.thermastor.com/pdf/ua3fold.pdf
(No, I have no financial interest in the company!)
The company doesn't seem to understand what they have here, so they don't promote it properly, but the contractors and consultants I work with all over the South are highly impressed with its effectiveness, in many cases.
It's a HEPA air cleaner and high-efficiency dehumidifer that attaches to your existing HVAV system. It takes humid outside air and dehumidifies it deeply, then injects it into the structure. A friend of mine in Tampa is able to maintain his interior below 50% RH even during the most severe conditions.
A beneficial side-effect is that it positively pressurizes the structure, limiting intrusion of hot/humid outside air.
Cost: around $3k installed. A major bargain, IMHO.
There are both positive and negative energy usage effects, which vary by structure. In most cases, I suspect there would be little or no net energy usage increase. But a huge increase in comfort and livability. Not to mention an enormous decrease in the likelihood of mold growth.