Neat little application. Not too big a download even on dialup. Even more reasonable if you have Java runtime already.
http://www.pathnet.org/sp.asp?mc=tools_doctor
Lets you set up a prospective home for analysis and then to check it with various lifecycle costs of materials. You can design for cheapest installation, a lot of builders are going this way. Or lowest lowest life cycle cost. Or highest durability.
From the same site:
http://www.pathnet.org/index.asp
There are a couple of neat tools which may interest you:
http://www.pathnet.org/sp.asp?mc=tools_techsets