We live in North Carolina and we were considering putting foam insulation into our 30 year old home. We have spoken with companies at home shows, and their estimate (without coming to the house) is between $5000-7000. We looked on-line and found some DIY foam insulation kits that were much more economical, and were considering those. Has anyone used one of these kits? is it hazardous (I always see people in full body suits on shows or in pictures)?