Low e means low e emissivity. This means that the door has a higher insulating ability than the normal glass. Less heat or cold passes through it.
You can order it with low E glass but not double pane.
No, you'll have to buy the handle kit separately.
Yes, you can order double doors, but you must order at your local Home Depot
Yes, it came with a full pane of glass and a screen you can choose which one you'll use, not both at the same time.
You can place a special order for this size at the Millwork desk in any Home Depot.
Thank you for your question. The replacement parts are all included in the door's package. For more door information, please visit our website https://www.stormdoors.com/ or inquire at the nearest Home Depot Store in your area. Have a great day! - Irene