"The performance of insulation is highly dependent on the quality of the installation." -ENERGYSTAR
If you are considering blown insulation, let a professional with years of experience handle the dirty, dusty, tedious job of adding attic insulation.
A conditioned crawlspace is a healthy home. Special consideration needs to be given to equipment and location.
Batt insulation has a wide variety of uses and is the most commonly used insulation material.