What is Energy Efficiency?
With double or triple-pane glass, low-E coatings, and eco-friendly vinyl frames, our windows are as energy-efficient as they are beautiful. Energy-efficient doors and windows help keep cooled and heated air inside your home where it belongs. This allows your home’s HVAC system to work more efficiently, reducing the amount of greenhouse gases released into the environment and saving you money on your energy bills every month.
If your energy bills are higher than they have been in the past and there’s not an obvious reason, your windows may be forcing your HVAC system to work harder. Window World customers report saving money on their energy bills from the first month.
The Technology
Science Behind The Savings
Windows
Doors
Siding
Low-E Glass
Low-E glass is brilliantly engineered to block most UV rays out so your home stays at a comfortable temperature each season.
Warm-Edge Spacer
Intercept™ warm-edge spacer insulates the exterior edges of a sealed unit and can tack on 5% savings on monthly energy costs.
Vinyl Framing
Vinyl window frames are constructed to deliver excellent thermal insulation while sealing out drafts and unwanted weather.
Innovative Weatherstripping
Airtight weatherstripping seals the sides, top and bottom frames of your door to prevent air infiltration.
Insulated Core
An insulated polyurethane core provides an additional thermal barrier for better insulation.
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 are an integral part in a door system’s seal and thermal performance.
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.
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. Explore the requirements to become ENERGY STAR-certified below and see what it looks like in your region of the country.
U-Value
R-Value
Your Climate
U-Factor Requirements
U-Factor measures the rate at which heat flows through an object. 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 Long Island 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 (low-emissivity) glass has been treated with a microscopic metallic coating designed to filter the amount of UV light that enters your home. By filtering the amount of UV light that enters your home, it keeps the heat gain lower in warm seasons and allows more heat in during cooler months. This keeps your home’s temperature more consistent year-round. By filtering out UV light, low-E glass also prevents fading on your furniture and window treatments.
U-Factor
U-factor measures the rate of heat transfer and how well a window insulates. It is measured on a scale from 0.20 to 1.20. The lower the u-factor, the more effective the window is at insulating.
R-Value
R-value refers to a building material’s insulation level. Each region of the US has an energy-efficient r-value range for windows based on that area’s climate.
Argon Gas
Argon is an extremely dense colorless, odorless gas with very low thermal conductivity. It is used as insulation between double-pane and triple-pane windows. When paired with Low-E glass, it keeps the window closer to room temperature, helping eliminate drafts and increase energy efficiency.
Warm-Edge Spacer System
Spacers are placed between double and triple-panes of glass. In the past, they were mainly made of aluminum, which we no longer recommend due to its poor insulating properties. Our Intercept™ warm-edge spacer system extends the shelf-life of window glass by reducing condensation build-up and edge-to-glass temperatures. Designed to seal in escaping heat, this spacer system is the most effective on the market.
What Makes Windows Energy-Efficient?
Our Experts Explain Energy Efficiency
Have more questions about energy efficiency? Our home improvement experts have answers. Watch the video to the left and check out our guide to energy-efficient windows to learn more!