In the world of energy efficient windows, there exist the type of gas that is in between the glass pane.  There are two gases that is the most popular to be used for energy efficient windows.

Argon gas and Krypton gases stepped up to the plate to arm homeowners with the ammo to insulate their vinyl windows.  At the moment this is the best hi tech component that is crucial in window world.

Every big window company applies one or both of these gases. West Coast Vinyl, Pella, Anderson, Milgard, Penguin all use these gases to enhance their energy efficient windows.

Both gases are odorless, colorless, and non toxic inert gas used in between glass panes to increase insulation and energy efficiency.

Argon gas is cheaper and more readily available.  Krypton gas costs more due to better thermal performance which results in better insulation than Argon gas.  However, some manufactures may combine the two gases to balance the cost and performances.

The benefits of having either gases in the energy efficient windows is worth having in the long run.  The question is, what can you afford to have this hi tech energy efficient window installed?  Krypton gas costs more but, yields greater insulation incrementally.

The choice is yours, do what is right for your pocket and peace of mind.