I am trying to better control moisture and flow of air under my house.
A termite inspection company that is treating my house has suggested
Automatic Foundation Vents. These vents open at 70 degrees and close
at 40 degrees.

Here is a link to the product:
http://www.tempvent.com/product_auto.html

I have 16 vents in my house, and was given an estimate of $500 -
installed ($31 per vent, down from $45). Cosmetically, they will look
better on my 40+ year old house - - however, I want to know if they
work.

Some Questions:

1. Do these vents work and are they worth the money?

2. Any experience with temp-vent, or are they all about the same?

3. Any other advice on this subject?

Thank you!