"Good, Better, and Best"

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At bare minimum, a modern replacement window will have two panes of glass, and will often have argon gas fill between the panes as insulation.  Windows in this class will carry a Limited Lifetime Warranty on vinyl frames and 20 years on hardware, screens, and glass.

Example: Simonton ProFinish

Windows in this class are highly recommended for their overall performance.  Expect a window in this category to have double or even triple panes, argon gas insulation, and a Double Lifetime Warranty.  Any window in this category will carry the Energy Star label and will qualify for home tax credit.

Example: Simonton Reflections 5500

Windows in this class are elite in every way.  Double and even triple pane glass is available.  Impact-rated hurricane windows for High-Velocity Hurricane Zones and Energy Star ratings for the harsh, hot, and stormy Southern zone.  Sound-proofing by a 50% dampening over standard glass.

Example: Simonton Stormbreaker