At The Window Source of Grand Rapids, our windows are designed to withstand both extreme heat and severe cold, providing year-round comfort. This not only enhances your comfort level but also enables noteworthy energy savings. Need evidence? We either meet or surpass the existing ENERGY STAR® Version 6.0 requirements in every state and can outdo the Northern Zone criteria by up to 48% with chosen glass packages. You’ll find four prevalent ratings offered for our windows that are certified by the National Fenestration Rating Council (NFRC) in Grand Rapids.
- U-Factor – This term stands for the level of heat transfer through a window. A lower U-Factor means a window is performing to a higher standard and can assist in reducing the heating and cooling costs in your Grand Rapids home.
- Solar Heat Gain Coefficient (SHGC) –This defines the quantity of solar radiation that a window permits to travel through it. The lower this coefficient, the less solar heat gain and UV rays are allowed to infiltrate your Grand Rapids home’s interior.
- Visible Light Transmittance (VT) – A scale from 0 – 1, this measures the quantity of light that a window allows to pass through it. The bigger the number, the more light that can filter into your Grand Rapids dwelling.
- Condensation Rating (CR) – CR calculates how robustly a window can resist internal condensation buildup. This rating is a number between 1 – 100. The bigger the number, the more effectively the window can combat condensation in your Grand Rapids home.
Energy Efficient Glass Ratings
| NFRC Ratings | U-Factor | SHGC | VT | CR |
| Energy Miser 2-IS | .22 | .24 | .38 | 53 |
| Energy Miser 2 | .25 | .24 | .40 | 64 |
| Energy Miser IS | .26 | .26 | .50 | 41 |
| Energy Miser | .30 | .27 | .51 | 52 |
| Clear (No LowE) | .49 | .59 | .61 | 38 |
*Air Infiltration ratings are ≤ 0.3 US (≤ 1.5 Metric) or better for all Window Source Windows.
Energy Miser glass options keep you warmer in the winter and cooler in the summer.
All Energy Miser Options Are UV Resistant
Harmful UV rays can cause more harm to your Grand Rapids home than you may realize. For instance, without the correct protection applied to your windows, these rays can fade precious items within your home. The UV resistant windows provided by The Window Source of Grand Rapids serve as a sunblock for your residence, hindering damaging ultraviolet rays without noticeably diminishing the natural light entering your home. Our windows come equipped with Low-E coating options that enhance window performance and significantly cut down on the fading and sun damage to your furniture, carpets and flooring, maintaining their vibrant and appealing appearance. These energy-efficient features can lead to significant savings for you!
