I was told my a window rep that the air in the spacing in a window is just as good as the gas because over a couple of years the argon gas disappears especially in the hotter climets (i'm in FL). Does anyone agree or disagree? The window he is proposing is manufactured by CWS (Custom Window Systems Windpact Plus Window) which has air in the spacing and does not have an option for the argon gas. I would appreciate any input. Thank you.
Shocking that he would suggest that given that he doesn't have that option.
He is wrong. There are certainly established gas leakage rates, however, depending on the efficacy of the spacer system, the gas will leak at such a slow rate that it will last for 20+ years.
Also, argon does add to the efficiency of the window when compared to air alone. Some estimate around 20%. Granted it is more beneficial in colder climates, increases in efficiency will still pay dividends in your situation as well.