Low Emissivity Glass
Low-emissivity glass, also called low-e glass, is glass that has been coated with a special layer that lets daylight into the home and reduces the amount of heat that can escape back out through the window. This significantly reduces heat transfer and redirects interior heat around the inside of the home instead of letting it dissipate. Replacing non low-e glass with low-e coated glass can cut your home’s energy usage in half and cut the amount of heat lost through windows by up to 75 percent. During cold weather, low-e glass retains significant solar heat.
Because heat always escapes into where it is cold, low-e coating works by repelling a certain amount of heat absorption and instead keeps the heat around and recirculating indoors. Using low-e glass in a double glazed IGU means that the exterior pane gets less warmth from normally-escaping heat and the interior pane warms up more than usual due to increased retained heat. This cuts down considerably on cold draughts by the windows and cuts down on any potential formation of condensation on your windows. Low-e glazing is thus well worth the consideration for stopping heat loss and staying warm during wintry and rainy weather.
So the answer is yes it is worth it. The elimination of condensation and the heat retention makes using Low E essential when double glazing your home.