Insulated

Patio door is probably the biggest opening (after the garage door) in your house.

And most of the patio door area is glass. That’s why choosing a patio door with a high-performance energy efficient glass should be number one consideration on your check list when you’re shopping for a new door. Most reputable patio door manufacturers include some kind of “warm edge glazing” system.
This system increases the temperature around the edge of the glass, therefore, increasing its thermal performance, and minimizing the possibility of condensation and frost. Typically, a good warm edge glazing system features a non-metal spacer in between panes of glass.
 

This spacer offers you a reduced heat loss, warmer glass temperature and reduced noise from the outdoors.

This type of spacer in combination with UV-filtering LowE glass, and argon gas dramatically enhances energy efficiency. Together, these features, can cut the damaging effects of the sun, which can lead to the fading of carpets, curtains, and furniture, by an additional 72% over clear insulated glass. In winter, a warmer glass temperature is maintained, increasing the R-Value by up to an additional 96%. In summer, up to 65% reduction in solar heat gain helps reduce air conditioning costs.