Low E glass. Low-E .30 / .18\. Meaning of the numbers?

I am checking a ThermaTru door and the best glass they offer is a  Low-E .30 / .18. How good is this glass, compared for example with a triple pane glass? Any big difference? I am trying to get the best reasonable priced glass door.

brklynreno

in Doors & Windows 14 years and 3 months ago

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stevenjames | 11 years and 1 month ago

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Low-E glass typically costs about 15% more than ordinary glass, but it reduces energy use by as much as 30-50%, by using most of the heat gain in winter but keep the harmful UV rays out during the summer, and when used in insulated glass units – can have even better benefits.

bowl-of-dicks | 14 years and 3 months ago

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This is probably SHGC (solar heat gain cooefficient) but tough to tell without more information.