Originally Posted by pennywise
If I loose the argon gas I loose my energy rating.
You should be aware that argon filled sealed units will lose their argon over time anyhow. Argon atoms are so small that they literally leak through any sealants used to make sealed units. But, even with 10 or 20 percent of the argon leaked out, the remaining argon in the space between the panes should still provide for less heat loss than air in that space.