How Important is Window Insulation?
ENERGY STAR, R Value, U Value, Solar Heat Gain Coefficient - insulation is essential. Insulation ensures your window is operating at its best performance. It helps reduce energy consumption (and energy bills), improves air quality and increases comfort on a daily basis.
The R-Value is the resistance of a given material to thermal transmission. The higher it is, the better. The insulation specialist will often refer to the R-value and how it is an important number. Please note that a typical wall gets a R-25 rating, whereas an excellent window gets a R-5 rating. R-Value should not be your sole criterion.
The U-Value indicates the heat transfer rate. This is calculated by inverting the R-value 1/R. The lower it is the better insulation.
The ER Coefficient or Energy Rating (ER) calculation is based on the heat transfer U-Value, solar heat gain and air leakage. The higher the ER, the better the energy performance. ER value is the most accurate form of measurement for thermal performance of a window. A customer should always be looking for the Energy Star label that is placed on the most efficient products.
ENERGY STAR® Certification is a voluntary certification obtained by manufacturers. ENERGY STAR® certification is proof that a product is eco-energetic and that its insulation quality has been attested by an independent expert. There are products on the market today that offer excellent energy performance but are not ENERGY STAR® certified. It is up to the Consumer to inquire if their windows are ENERGY STAR® certified.
If you would like more information on this certification, please visit:
Other label certifications should include permanent stickers such as the Gold Seal Label for ENERGY STAR®
Another great way to enjoy the maximum energy benefits from your windows is insulated frames.
Contact Kehl for details on our All Season Premium window.