Measure twice, cut once.  

They will go out and measure and do our complete install.  

You should be able to get a meter to measure the humidity level from your local hardware store.

I think the three most important pieces are demonstrating how important it is to you, showing that you are serious and are taking active measures to be successful, and possibly tying it into your spouses interests somehow. 

Only thing I'd add is that people who have been around for a while tend to measure today against yesterday ("It's so much easier today than it was yesterday" or "the returns are lower than a few years ago") - it's human nature.But, it's not logical to base decisions off this thinking - we all have alternatives every day, and the only relevant data for an opportunity is TODAY compared with TOMORROW.  

While price is important, it was the only metric I was using to measure the success of a deal and I missed out on deals because it.  

When the fire dept. arrived, they measured the co levels and found them to be very high.

All we had to do was give a layout of space, measurements, where plumbing rough is was to be located and in each room and was a snap for us..

It shouldn't be used as a measure of return, but it often is.

I had estimates up to $12,000 - the $12,000 estimate measured the square footage of every wall, the ceiling and the floor (I think they had enough work to do and were over-bidding the project).