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Energy Efficiency

Increasing your home’s energy efficiency allows you to save money and the environment—without sacrificing an amenity.

Never Sacrifice Your Comfort
Boost Your Home's Energy Efficiency Today!

Table of Contents

Understanding Energy Efficiency

The Technology

Science Behind The Savings


Low-E Glass

Low-E glass is brilliantly constructed to minimize the amount of UV rays and unwanted temperatures into your home.

Warm-Edge Spacer

Our Duralite spacer system has no metal so the glass edge is up to 45% better insulated against energy loss.

Vinyl Framing

Vinyl window frames are constructed with a complex array of compartments to help trap and repel unwanted weather.

Innovative Weatherstripping

Airtight weatherstripping seals the sides, top and bottom frames of your door to prevent air infiltration.

Insulated Core

Insulated polyurethane core provides an additional thermal barrier.

Sturdy Frames

Composite frames resist rotting, rusting and warping to withstand constant exposure to the elements.

Energy-Saving Door Lites

Decorative and ENERGY STAR-compliant door lites that allow light in but keep the elements out.

Insulated Structure

Built with rigid foam insulation to reduce energy loss and reinforce the siding for smoothness and straight lines.

Energy-Saving Barriers

High-density insulation to minimize outdoor noise for a quieter indoor ambiance and loss of wanted heat or air.

Built to Last

Fully rolled over, double-thick nail hem anchors panels to the wall; tested to withstand harsh weather.


Help Save Energy and the Environment

In most instances, your windows come standard with the ENERGY STAR®-qualified SolarZone™ insulated glass package.

Window World of Connecticut’s replacement windows are already designed for superior thermal performance. By choosing our SolarZone™ Insulated Glass Package, featuring the Duralite® spacer system, you can help reduce your energy costs even more, while helping cut consumption of the fossil fuels that pollute our environment.

What Makes the SolarZone™ Insulated Glass Package So Effective?

Since over 80% of a window is glass, substantial heating and cooling savings come from improved glass performance.

  • Our Duralite spacer system creates significant energy efficiency. It is 88% less conductive than metal spacers, offering superior insulation performance.
  • Adding Low-E glass to a standard insulating glass unit helps you improve the energy performance of your window year-round by 24%.
  • Adding argon gas filling to the window increases efficiency by another 6%.

The result: your monthly utility bills will reflect savings year round and that should help make you even more comfortable.

Climate Requirements

Interested in Becoming ENERGY STAR® Certified?

ENERGY STAR is a government-sanctioned symbol for energy efficiency, credibility, sustainability and cost-savings for the consumer. Browse below to explore what’s required to become ENERGY STAR-certified and what it looks like in your region of the country.

Your Climate

U-Factor Requirements

U-Factor measures the rate at which heat flows through an object. For all window products, the National Fenestration Rating Council (NFRC) tests and assigns a U-Value rating. The lower your U-value, the less heat your windows allow through them.

  • Northern: ≤ .27
  • North-Central: ≤ .30
  • South-Central: ≤ .30
  • Southern: ≤ .40

R-Value Requirements

R-Value determines how well the insulation inside your window is performing. The higher your R-value, the better insulated your window is.

  • Northern: 13 – 21
  • North-Central: 13 – 21
  • South-Central: 13 – 21
  • Southern: 13 – 21

Why You Need A High-Performing Insulated Product

Window World of Connecticut is located in ENERGY STAR’s Northern Climate category. To maintain certification here, our windows and doors must maintain a U-Value of ≤ .27 and an R-Factor from 13 to 21.

Glossary Of Terms

Energy Efficiency Terms You Need To Know

Low-E Glass

Low-E glass is a type of glass that has been treated with a microscopic, metallic coating designed to filter certain types of light into your home. The glass blocks heat gain from the sun’s reflected rays in warmer months and allows warmth from the sun’s shorter rays to flow into your home during cooler seasons.

Warm-Edge Spacer System

The Duralite spacer system reduces conductivity by 45%. This means less heat loss and greater comfort in your home. Its innovative design eliminates metal in the window spacer and replaces over 60% of the window spacer profile with air. It features an air-filled polycarbonate shim, butyl sealant, three-sided continuous moisture barrier, and desiccated topcoat to deliver consistent, long-term performance. The result: enhanced comfort and thermal performance, improved argon gas retention and reduced condensation.

Thermal Performance

Inefficient windows allow warm air to escape your home in the winter and enter during the summer. This reduces interior comfort while needlessly overworking your HVAC equipment and increasing your energy costs. Windows built with our Duralite spacer system reduce air transfer, resulting in more comfortable and energy-efficient homes.

Argon Gas

Argon is a colorless, odorless and nonreactive insulating property with extremely high density and extremely low thermal conductivity, making it an ideal agent for year-round comfort. The Duralite spacer system is built to provide enhanced argon retention. The spacer features one of the industry’s best argon-resistant adhesives, which keeps the gas inside the insulated glass unit longer to help minimize overall energy consumption.

Make Your Home Energy-Efficient

When it comes to making your home energy-efficient, there really is no risk. The payoff is not only significant, but also tangible. You will reap the benefits in comfortability and cost, as energy-efficient products are an investment that pay for themselves time and time again.

When you install energy-efficient windows from Window World of Connecticut, you’ll see dramatic differences in your heating and cooling bills. Contact our professionals today for a free in-home estimate or to answer any questions you may have about energy efficiency!

Schedule Your Free In-Home Estimate Today.

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