A. Absolutely. Argon gas is an inert gas that is odorless, colorless and heavier than air and is completely safe. Q. Why use Argon Gas? A. Argon gas is used in a window because heat and cold do not pass through it as easily as air. Its insulation characteristics are what make it so attractive when combined with various Low E glasses. Q. What is an R-value and how important is it? A. "R" stands for resistance. The higher the "R" factors, the better the insulation characteristics. The "R" value of a windows frame and glass is very important since it directly relates to how well the window will reduce energy consumption. A higher R-value will perform better in reducing energy costs than a lower R-value.