Glass and Glazing

The Premium Series ENERGY PACKAGES

Featuring vacuum-deposition Low-E glass, Argon gas filling and polyurethane- insulated frames, our Premium Series ENERGY PACKAGES are among the most advanced insulating glass systems you'll find anywhere. Add the low conductivity of vinyl frames and these replacement windows are among the most energy efficient you can buy.

ENERGY PACKAGE (Available 3500 Only)
Dramatically increases comfort in both summer and winter

  • One lite of Low-E insulating glass
  • Argon gas
  • Polyurethane-insulated frame

ENERGY PACKAGE PLUS (Available 3500 Only)
Performs twice as well as standard insulated windows and over three times better than single-pane windows 

  • Two lites of Low-E insulating glass
  • Argon gas insulation chamber
  • Polyurethane-insulated frame

ENERGY PACKAGE MAX (Available 3500 Only)
Nearly six times more energy efficient than single pane glass

  • Two lites of Low-E insulating, plus interior glass substrate
  • Two insulating chambers of Argon gas
  • Polyurethane-insulated frame

Napco® Premium 2500 & 3500 Windows with Low-E glass packages meet ENERGY STAR requirements.

Our Premium ENERGY PACKAGE options (3500 only) exceed ENERGY STAR requirements.

The ENERGY STAR Window Program is a voluntary partnership between the U.S. Department of Energy and participating window manufacturers.  ENERGY STAR performance requirements are tailored to fit energy needs of the country's northern, central, and southern states.  Your investment in ENERGY STAR windows will pay for itself overtime, and then the savings is money in the bank every year!

You'll be doing your part to help the environment.  In fact, if all households and businesses bought ENERGY STAR products for the next 15 years, our national energy bill would be reduced by approximately $100 billion.  The reduction in carbon dioxide emissions would be equivalent to reducing gasoline consumption by 120 billion gallons, taking 17 million cars off the road, or preserving 142 million acres of trees for the next 15 years.*

By choosing Napco Window Systems, you can cut your heating and cooling costs, help make your home more comfortable and reduce air pollution - all without sacrificing versatility or style.

Napco Window Systems ... good for you, good for your home, and good for the environment.

*ENERGY STAR qualification is based on NFRC certified product ratings.

Low-E glass

Because our Low-E coating utilizes silver (unlike the tin-oxide used with conventional low-emissivity glass), your home stays bright all year long with nearly 88% light transmission. The benefit is a clear view all year long - with a warmer glass temperature in the winter, and a cooler glass temperature in the summer. 


In the winter when the sun’s angle is low, Low-E glass deflects radiant heat and minimizes its flow while maintaining a consistent level of comfort.

In the summer when the sun is higher, the thin reflecting glazing reflects harmful radiant heat reducing heat gain and reducing cooling bills.  Low-E glass also significantly reduces harmful ultra-violet rays.

Insulated Frames (Available 3500 Only)           

As part of the Napco ENERGY PACKAGE, we fill our multi-chambered vinyl sections with highly insulating polyurethane foam. Our process ensures that extrusions are completely filled and never have voids or pockets.           

Warm-edge Intercept® insulated glass

Warm-edge Intercept® insulated glass reduces thermal transfer around the glass perimeter by utilizing a unique U-shaped channel to separate glass panes and interrupt the natural flow of heat to cold.  This remarkable technology provides an insulated glass system of unsurpassed performance and durability.