Low E argon is a gas insulation barrier between the glass preventing heat and cold transfer.
no or to low of amounts of argon gas (insulation between the two panes of glass) will not meet building codes and will also cause you loss of heat or ac. all windows ARE built to the minimum code requirement, but I always recommend going above the minimum requirements if possible.
Low E argon filled windows were created to restrict the amount of UV rays from the sun that can pass through the window into your home. This does not interfere with the amount of actual light coming into the room. It helps with heating and cooling.
Low E argon filled windows have a double pane, gasket sealed sash that is filled with argon gas which acts as an insulator but what makes these windows really stand out performance wise is that the inside of the glass is coated with tiny metal flecks. These metal pieces, invisible to the eye are angled precisely so that in the winter when the sun is lower on the horizon they allow uv rays to enter your home and to add solar heat. Conversely in the summer when the sun is higher they reflect the sun and keep your home cooler. These windows are actually quite technologically advanced.
The argon is a gas insulation barrier between the glass.As more insulation as more efficient .
The simple answer Argon is heavier than air therefore the transfer of energy loss is slowed
Low-E with argon gas can lower your U-Value several points…for instance if the window has only Low-E glass with a U-Value of .33, by adding argon gas you may see a U-Value of .29 - the lower the U-Value the better.