The argon gas in a window is only temporary as it dissipates over time. The rate at which it dissipates is a question that will garner different answers depending on whom is asked. Some say argon leaves a window at a rate of 10% per year whereas others may say 5-8%. And yet another answer we have heard is that the argon is completely gone in a few years. Being that it is invisible, how is a person to know for sure?