Our energy efficient windows at The Window Source of Nashville are designed to withstand extreme heat and cold while also providing four-season comfort and energy savings. This keeps your house warm or cool while also saving you money throughout the course of the windows’ lifetime.
Want proof? In addition to meeting or exceeding the requirements for ENERGY STAR® Version 6.0 in all 50 states, we also surpass those for the Northern Zone by up to 48% with certain glass packages. Below are four common ratings that are provided for windows certified by the National Fenestration Rating Council (NFRC):
- U-Factor – A measure of the rate of heat flow through a window. A lower U-Factor indicates a higher performing window that can help reduce heating and cooling costs.
- Solar Heat Gain Coefficient (SHGC) – The amount of solar radiation allowed to pass through a window. The lower the number, the less solar heat gain and UV rays the window permits to enter.
- Visible Light Transmittance (VT) – Ranging from 0 – 1, visible transmittance is a measure of how much light passes through the window. The higher the number, the more light that can pass through.
- Condensation Rating (CR) – CR measures how well a window resists the formation of condensation on the inside surface. CR is expressed as a number between 1 – 100.The higher the number, the better a product is able to resist condensation.
Energy Efficient Windows:
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
Our Energy Miser Options Are All UV Resistant
Unsafe UV rays can harm your property more than you might imagine. If you don’t take the right safeguards on your windows, these rays might fade high price items you have inside your home, like curtains, furniture, carpets, and rugs,
As a sunscreen for your home, our UV-resistant energy efficient windows may filter harmful ultraviolet rays without significantly limiting the amount of light that enters. Your home furnishings will stay vibrant and lovely thanks to the Low-E coating options, which improve window performance and assist to greatly prevent fading and sun damage. Discuss our energy-saving options with one of our specialists to learn how you can save money!
